619 lines
28 KiB
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619 lines
28 KiB
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<title>INTRO</title>
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<body>
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<h1 align=center>INTRO</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#DATA TYPES">DATA TYPES</a><br>
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<a href="#LIST OF ROUTINES">LIST OF ROUTINES</a><br>
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<a href="#TAG USAGE">TAG USAGE</a><br>
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<a href="#PSEUDO TAGS">PSEUDO TAGS</a><br>
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<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<a href="#BUGS">BUGS</a><br>
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<hr>
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<!-- Creator : groff version 1.17.2 -->
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<!-- CreationDate: Mon Dec 22 00:39:19 2003 -->
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<a name="NAME"></a>
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<h2>NAME</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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libtiff - introduction to <i>libtiff</i>, a library for reading and writing <small>TIFF</small> files</td></table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>#include <tiffio.h></b><br>
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cc file.c <b>-ltiff</b></td></table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<i>libtiff</i> is a library for reading and writing data
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files encoded with the <i>Tag Image File</i> format,
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Revision 6.0 (or revision 5.0 or revision 4.0). This file
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format is suitable for archiving multi-color and
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monochromatic image data.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The library supports several compression algorithms, as
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indicated by the <i>Compression</i> field, including: no
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compression (1), <small>CCITT</small> 1D Huffman compression
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(2), <small>CCITT</small> Group 3 Facsimile compression (3),
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<small>CCITT</small> Group 4 Facsimile compression (4),
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Lempel-Ziv & Welch compression (5), baseline JPEG
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compression (7), word-aligned 1D Huffman compression
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(32771), and PackBits compression (32773). In addition,
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several nonstandard compression algorithms are supported:
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the 4-bit compression algorithm used by the
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<i>ThunderScan</i> program (32809) (decompression only),
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NeXT's 2-bit compression algorithm (32766) (decompression
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only), an experimental LZ-style algorithm known as Deflate
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(32946), and an experimental CIE LogLuv compression scheme
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designed for images with high dynamic range (32845 for LogL
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and 32845 for LogLuv). Directory information may be in
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either little- or big-endian byte order-byte swapping is
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automatically done by the library. Data bit ordering may be
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either Most Significant Bit ( <small>MSB</small> ) to Least
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Significant Bit ( <small>LSB</small> ) or <small>LSB</small>
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to <small>MSB.</small> Finally, the library does not support
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files in which the <i>BitsPerSample</i>, <i>Compression</i>,
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<i>MinSampleValue</i>, or <i>MaxSampleValue</i> fields are
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defined differently on a per-sample basis (in Rev. 6.0 the
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<i>Compression</i> tag is not defined on a per-sample basis,
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so this is immaterial).</td></table>
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<a name="DATA TYPES"></a>
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<h2>DATA TYPES</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The library makes extensive use of C typedefs to promote
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portability. Two sets of typedefs are used, one for
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communication with clients of the library and one for
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internal data structures and parsing of the
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<small>TIFF</small> format. The following typedefs are
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exposed to users either through function definitions or
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through parameters passed through the varargs
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interfaces.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="18%"></td><td width="82%">
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<pre>typedef unsigned short uint16; 16-bit unsigned integer
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typedef unsigned <<i>thing</i>> uint32; 32-bit unsigned integer
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typedef unsigned int ttag_t; directory tag
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typedef uint16 tdir_t; directory index
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typedef uint16 tsample_t; sample number
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typedef uint32 tstrip_t; strip number
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typedef uint32 ttile_t; tile number
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typedef int32 tsize_t; i/o size in bytes
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typedef void* tdata_t; image data ref
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typedef void* thandle_t; client data handle
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typedef int32 toff_t; file offset
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</pre></td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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Note that <i>tstrip_t</i>, <i>ttile_t</i>, and
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<i>tsize_t</i> are constrained to be no more than 32-bit
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quantities by 32-bit fields they are stored in in the
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<small>TIFF</small> image. Likewise <i>tsample_t</i> is
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limited by the 16-bit field used to store the
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<i>SamplesPerPixel</i> tag. <i>tdir_t</i> constrains the
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maximum number of <small>IFDs</small> that may appear in an
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image and may be an arbitrary size (w/o penalty).
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<i>ttag_t</i> must be either int, unsigned int, pointer, or
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double because the library uses a varargs interface and
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<small>ANSI C</small> restricts the type of the parameter
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before an ellipsis to be a promoted type. <i>toff_t</i> is
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defined as int32 because TIFF file offsets are (unsigned)
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32-bit quantities. A signed value is used because some
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interfaces return -1 on error. Finally, note that
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user-specified data references are passed as opaque handles
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and only cast at the lowest layers where their type is
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presumed.</td></table>
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<a name="LIST OF ROUTINES"></a>
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<h2>LIST OF ROUTINES</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The following routines are part of the library. Consult
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specific manual pages for details on their operation. The
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manual page names listed below are for systems where the
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full function names can not be encoded in the filesystem; on
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most systems doing ``man function-name'' will
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work.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<pre>
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<i>Name Appears on Page Description
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</i>TIFFCheckpointDirectory writedir.3t writes the current state of the directory
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TIFFCheckTile tile.3t very x,y,z,sample is within image
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TIFFCIELabToRGBInit color.3t initialize CIE L*a*b* 1976 to RGB conversion state
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TIFFCIELabToXYZ color.3t perform CIE L*a*b* 1976 to CIE XYZ conversion
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TIFFClientOpen open.3t open a file for reading or writing
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TIFFClose close.3t close an open file
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TIFFComputeStrip strip.3t return strip containing y,sample
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TIFFComputeTile tile.3t return tile containing x,y,z,sample
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TIFFCurrentDirectory query.3t return index of current directory
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TIFFCurrentRow query.3t return index of current scanline
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TIFFCurrentStrip query.3t return index of current strip
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TIFFCurrentTile query.3t return index of current tile
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TIFFDataWidth width.3t return the size of TIFF data types
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TIFFError error.3t library error handler
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TIFFFdOpen open.3t open a file for reading or writing
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TIFFFileName query.3t return name of open file
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TIFFFileno query.3t return open file descriptor
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TIFFFindCODEC codec.3t find standard codec for the specific scheme
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TIFFFlush flush.3t flush all pending writes
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TIFFFlushData flush.3t flush pending data writes
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TIFFGetBitRevTable swab.3t return bit reversal table
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TIFFGetField getfield.3t return tag value in current directory
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TIFFGetFieldDefaulted getfield.3t return tag value in current directory
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TIFFGetMode query.3t return open file mode
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TIFFGetVersion query.3t return library version string
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TIFFIsCODECConfigured codec.3t check, whether we have working codec
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TIFFIsTiled query.3t return true if image data is tiled
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TIFFIsByteSwapped query.3t return true if image data is byte-swapped
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TIFFNumberOfStrips strip.3t return number of strips in an image
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TIFFNumberOfTiles tile.3t return number of tiles in an image
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TIFFOpen open.3t open a file for reading or writing
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TIFFPrintDirectory print.3t print description of the current directory
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TIFFReadBufferSetup rdbuf.3t specify i/o buffer for reading
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TIFFReadDirectory readdir.3t read the next directory
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TIFFReadEncodedStrip rdestrip.3t read and decode a strip of data
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TIFFReadEncodedTile rdetile.3t read and decode a tile of data
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TIFFReadRawStrip rdrstrip.3t read a raw strip of data
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TIFFReadRawTile rdrtile.3t read a raw tile of data
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TIFFReadRGBAImage rdimage.3t read an image into a fixed format raster
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TIFFReadScanline readline.3t read and decode a row of data
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TIFFReadTile readtile.3t read and decode a tile of data
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TIFFRegisterCODEC codec.3t override standard codec for the specific scheme
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TIFFReverseBits swab.3t reverse bits in an array of bytes
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TIFFRGBAImageBegin rgbaimage.3t setup decoder state for TIFFRGBAImageGet
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TIFFRGBAImageEnd rgbaimage.3t release TIFFRGBAImage decoder state
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TIFFRGBAImageGet rgbaimage.3t read and decode an image
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TIFFRGBAImageOK rgbaimage.3t is image readable by TIFFRGBAImageGet
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TIFFScanlineSize size.3t return size of a scanline
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TIFFSetDirectory setdir.3t set the current directory
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TIFFSetSubDirectory setdir.3t set the current directory
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TIFFSetErrorHandler error.3t set error handler function
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TIFFSetField setfield.3t set a tag's value in the current directory
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TIFFSetWarningHandler error.3t set warning handler function
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TIFFStripSize strip.3t returns size of a strip
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TIFFRawStripSize strip.3t returns the number of bytes in a raw strip
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TIFFSwabShort swab.3t swap bytes of short
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TIFFSwabLong swab.3t swap bytes of long
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TIFFSwabArrayOfShort swab.3t swap bytes of an array of shorts
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TIFFSwabArrayOfLong swab.3t swap bytes of an array of longs
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TIFFTileRowSize size.3t return size of a row in a tile
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TIFFTileSize size.3t return size of a tile
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TIFFUnRegisterCODEC codec.3t unregisters the codec
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TIFFVGetField getfield.3t return tag value in current directory
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TIFFVGetFieldDefaulted getfield.3t return tag value in current directory
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TIFFVSetField setfield.3t set a tag's value in the current directory
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TIFFVStripSize strip.3t returns the number of bytes in a strip
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TIFFWarning warning.3t library warning handler
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TIFFWriteDirectory writedir.3t write the current directory
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TIFFWriteEncodedStrip wrestrip.3t compress and write a strip of data
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TIFFWriteEncodedTile wretile.3t compress and write a tile of data
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TIFFWriteRawStrip wrrstrip.3t write a raw strip of data
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TIFFWriteRawTile wrrtile.3t write a raw tile of data
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TIFFWriteScanline writeline.3t write a scanline of data
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TIFFWriteTile wrrtile.3t compress and write a tile of data
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TIFFXYZToRGB color.3t perform CIE XYZ to RGB conversion
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TIFFYCbCrToRGBInit color.3t initialize YCbCr to RGB conversion state
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TIFFYCbCrtoRGB color.3t perform YCbCr to RGB conversion
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</pre></td></table>
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<a name="TAG USAGE"></a>
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<h2>TAG USAGE</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The table below lists the <small>TIFF</small> tags that are
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recognized and handled by the library. If no use is
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indicated in the table, then the library reads and writes
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the tag, but does not use it internally. Note that some tags
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are meaningful only when a particular compression scheme is
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being used; e.g. <i>Group3Options</i> is only useful if
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<i>Compression</i> is set to <small>CCITT</small> Group 3
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encoding. Tags of this sort are considered
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<i>codec-specific</i> tags and the library does not
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recognize them except when the <i>Compression</i> tag has
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been previously set to the relevant compression
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scheme.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<pre>
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<i>Tag Name Value R/W Library Use/Notes
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</i>Artist 315 R/W
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BadFaxLines 326 R/W
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BitsPerSample 258 R/W lots
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CellLength 265 parsed but ignored
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CellWidth 264 parsed but ignored
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CleanFaxData 327 R/W
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ColorMap 320 R/W
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ColorResponseUnit 300 parsed but ignored
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Compression 259 R/W choosing codec
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ConsecutiveBadFaxLines 328 R/W
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Copyright 33432 R/W
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DataType 32996 R obsoleted by SampleFormat tag
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DateTime 306 R/W
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DocumentName 269 R/W
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DotRange 336 R/W
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ExtraSamples 338 R/W lots
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FaxRecvParams 34908 R/W
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FaxSubAddress 34909 R/W
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FaxRecvTime 34910 R/W
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FillOrder 266 R/W control bit order
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FreeByteCounts 289 parsed but ignored
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FreeOffsets 288 parsed but ignored
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GrayResponseCurve 291 parsed but ignored
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GrayResponseUnit 290 parsed but ignored
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Group3Options 292 R/W used by Group 3 codec
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Group4Options 293 R/W
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HostComputer 316 R/W
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ImageDepth 32997 R/W tile/strip calculations
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ImageDescription 270 R/W
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ImageLength 257 R/W lots
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ImageWidth 256 R/W lots
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InkNames 333 R/W
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InkSet 332 R/W
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JPEGTables 347 R/W used by JPEG codec
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Make 271 R/W
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Matteing 32995 R obsoleted by ExtraSamples tag
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MaxSampleValue 281 R/W
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MinSampleValue 280 R/W
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Model 272 R/W
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NewSubFileType 254 R/W called SubFileType in spec
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NumberOfInks 334 R/W
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Orientation 274 R/W
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PageName 285 R/W
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PageNumber 297 R/W
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PhotometricInterpretation 262 R/Wused by Group 3 and JPEG codecs
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PlanarConfiguration 284 R/W data i/o
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Predictor 317 R/W used by LZW and Deflate codecs
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PrimaryChromacities 319 R/W
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ReferenceBlackWhite 532 R/W
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ResolutionUnit 296 R/W used by Group 3 codec
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RowsPerStrip 278 R/W data i/o
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SampleFormat 339 R/W
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SamplesPerPixel 277 R/W lots
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SMinSampleValue 340 R/W
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SMaxSampleValue 341 R/W
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Software 305 R/W
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StoNits 37439 R/W
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StripByteCounts 279 R/W data i/o
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StripOffsets 273 R/W data i/o
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SubFileType 255 R/W called OSubFileType in spec
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TargetPrinter 337 R/W
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Thresholding 263 R/W
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TileByteCounts 324 R/W data i/o
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TileDepth 32998 R/W tile/strip calculations
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TileLength 323 R/W data i/o
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TileOffsets 324 R/W data i/o
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TileWidth 322 R/W data i/o
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TransferFunction 301 R/W
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WhitePoint 318 R/W
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XPosition 286 R/W
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XResolution 282 R/W
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YCbCrCoefficients 529 R/W used by TIFFRGBAImage support
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YCbCrPositioning 531 R/W tile/strip size calulcations
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YCbCrSubsampling 530 R/W
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YPosition 286 R/W
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YResolution 283 R/W used by Group 3 codec
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</pre></td></table>
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<a name="PSEUDO TAGS"></a>
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<h2>PSEUDO TAGS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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In addition to the normal <small>TIFF</small> tags the
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library supports a collection of tags whose values lie in a
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range outside the valid range of <small>TIFF</small> tags.
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These tags are termed <i>pseud-tags</i> and are used to
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control various codec-specific functions within the library.
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The table below summarizes the defined
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pseudo-tags.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<pre>
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<i>Tag Name Codec R/W Library Use/Notes
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</i>TIFFTAG_FAXMODE G3 R/W general codec operation
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TIFFTAG_FAXFILLFUNC G3/G4 R/W bitmap fill function
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TIFFTAG_JPEGQUALITY JPEG R/W compression quality control
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TIFFTAG_JPEGCOLORMODE JPEG R/W control colorspace conversions
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TIFFTAG_JPEGTABLESMODE JPEG R/W control contents of <i>JPEGTables</i> tag
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TIFFTAG_ZIPQUALITY Deflate R/Wcompression quality level
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TIFFTAG_PIXARLOGDATAFMT PixarLog R/Wuser data format
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TIFFTAG_PIXARLOGQUALITY PixarLog R/Wcompression quality level
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TIFFTAG_SGILOGDATAFMT SGILog R/W user data format
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</pre><b>TIFFTAG_FAXMODE</b></td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="21%"></td><td width="79%">
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Control the operation of the Group 3 codec. Possible values
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(independent bits that can be combined by or'ing them
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together) are: FAXMODE_CLASSIC (enable old-style format in
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which the <small>RTC</small> is written at the end of the
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last strip), FAXMODE_NORTC (opposite of FAXMODE_CLASSIC;
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also called FAXMODE_CLASSF), FAXMODE_NOEOL (do not write
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<small>EOL</small> codes at the start of each row of data),
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FAXMODE_BYTEALIGN (align each encoded row to an 8-bit
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boundary), FAXMODE_WORDALIGN (align each encoded row to an
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16-bit boundary), The default value is dependent on the
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compression scheme; this pseudo-tag is used by the various
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G3 and G4 codecs to share code.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>TIFFTAG_FAXFILLFUNC</b></td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
|
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<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the function used to convert arrays of black and
|
|
white runs to packed bit arrays. This hook can be used to
|
|
image decoded scanlines in multi-bit depth rasters (e.g. for
|
|
display in colormap mode) or for other purposes. The default
|
|
value is a pointer to a builtin function that images packed
|
|
bilevel data.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_IPTCNEWSPHOTO</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Tag contaings image metadata per the IPTC newsphoto spec:
|
|
Headline, captioning, credit, etc... Used by most wire
|
|
services.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_PHOTOSHOP</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Tag contains Photoshop captioning information and metadata.
|
|
Photoshop uses in parallel and redundantly alongside
|
|
IPTCNEWSPHOTO information.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_JPEGQUALITY</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the compression quality level used in the baseline
|
|
algorithm. Note that quality levels are in the range 0-100
|
|
with a default value of 75.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_JPEGCOLORMODE</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control whether or not conversion is done between RGB and
|
|
YCbCr colorspaces. Possible values are: JPEGCOLORMODE_RAW
|
|
(do not convert), and JPEGCOLORMODE_RGB (convert to/from
|
|
RGB) The default value is JPEGCOLORMODE_RAW.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_JPEGTABLESMODE</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the information written in the <i>JPEGTables</i>
|
|
tag. Possible values (independent bits that can be combined
|
|
by or'ing them together) are: JPEGTABLESMODE_QUANT (include
|
|
quantization tables), and JPEGTABLESMODE_HUFF (include
|
|
Huffman encoding tables). The default value is
|
|
JPEGTABLESMODE_QUANT|JPEGTABLESMODE_HUFF.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_ZIPQUALITY</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the compression technique used by the Deflate codec.
|
|
Quality levels are in the range 1-9 with larger numbers
|
|
yielding better compression at the cost of more computation.
|
|
The default quality level is 6 which yields a good
|
|
time-space tradeoff.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_PIXARLOGDATAFMT</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the format of user data passed <i>in</i> to the
|
|
PixarLog codec when encoding and passed <i>out</i> from when
|
|
decoding. Possible values are: PIXARLOGDATAFMT_8BIT for
|
|
8-bit unsigned pixels, PIXARLOGDATAFMT_8BITABGR for 8-bit
|
|
unsigned ABGR-ordered pixels, PIXARLOGDATAFMT_11BITLOG for
|
|
11-bit log-encoded raw data, PIXARLOGDATAFMT_12BITPICIO for
|
|
12-bit PICIO-compatible data, PIXARLOGDATAFMT_16BIT for
|
|
16-bit signed samples, and PIXARLOGDATAFMT_FLOAT for 32-bit
|
|
IEEE floating point samples.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_PIXARLOGQUALITY</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the compression technique used by the PixarLog
|
|
codec. This value is treated identically to
|
|
TIFFTAG_ZIPQUALITY; see the above description.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<b>TIFFTAG_SGILOGDATAFMT</b></td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="21%"></td><td width="79%">
|
|
Control the format of client data passed <i>in</i> to the
|
|
SGILog codec when encoding and passed <i>out</i> from when
|
|
decoding. Possible values are: SGILOGDATAFMT_FLTXYZ for
|
|
converting between LogLuv and 32-bit IEEE floating valued
|
|
XYZ pixels, SGILOGDATAFMT_16BITLUV for 16-bit encoded Luv
|
|
pixels, SGILOGDATAFMT_32BITRAW and SGILOGDATAFMT_24BITRAW
|
|
for no conversion of data, SGILOGDATAFMT_8BITRGB for
|
|
returning 8-bit RGB data (valid only when decoding
|
|
LogLuv-encoded data), SGILOGDATAFMT_FLTY for converting
|
|
between LogL and 32-bit IEEE floating valued Y pixels,
|
|
SGILOGDATAFMT_16BITL for 16-bit encoded L pixels, and
|
|
SGILOGDATAFMT_8BITGRY for returning 8-bit greyscale data
|
|
(valid only when decoding LogL-encoded data).</td></table>
|
|
<a name="DIAGNOSTICS"></a>
|
|
<h2>DIAGNOSTICS</h2>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
All error messages are directed through the <i>TIFFError</i>
|
|
routine. By default messages are directed to <b>stderr</b>
|
|
in the form: <i>module: messagen.</i> Warning messages are
|
|
likewise directed through the <i>TIFFWarning</i>
|
|
routine.</td></table>
|
|
<a name="SEE ALSO"></a>
|
|
<h2>SEE ALSO</h2>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<i>fax2tiff</i>(1), <i>gif2tiff</i>(1), <i>pal2rgb</i>(1),
|
|
<i>ppm2tiff</i>(1), <i>rgb2ycbcr</i>(1), <i>ras2tiff</i>(1),
|
|
<i>raw2tiff</i>(1), <i>sgi2tiff</i>(1), <i>tiff2bw</i>(1),
|
|
<i>tiffdither</i>(1), <i>tiffdump</i>(1), <i>tiffcp</i>(1),
|
|
<i>tiffcmp</i>(1), <i>tiffgt</i>(1), <i>tiffinfo</i>(1),
|
|
<i>tiffmedian</i>(1), <i>tiffsplit</i>(1),
|
|
<i>tiffsv</i>(1),</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<i>Tag Image File Format Specification -- Revision 6.0</i>,
|
|
an Aldus Technical Memorandum.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
<i>The Spirit of TIFF Class F</i>, an appendix to the TIFF
|
|
5.0 specification prepared by Cygnet
|
|
Technologies.</td></table>
|
|
<a name="BUGS"></a>
|
|
<h2>BUGS</h2>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
The library does not support multi-sample images where some
|
|
samples have different bits/sample.</td></table>
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="10%"></td><td width="90%">
|
|
The library does not support random access to compressed
|
|
data that is organized with more than one row per tile or
|
|
strip. The library discards unknown tags. The library should
|
|
do more validity checking of a directory's
|
|
contents.</td></table>
|
|
<hr>
|
|
</body>
|
|
</html>
|