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<title>TIFFOpen</title>
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<h1 align=center>TIFFOpen</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="#OPTIONS">OPTIONS</a><br>
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<a href="#BYTE ORDER">BYTE ORDER</a><br>
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<a href="#RETURN VALUES">RETURN VALUES</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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<hr>
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2003-11-27 10:07:01 -05:00
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<!-- Creator : groff version 1.17.2 -->
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2003-12-21 16:47:11 -05:00
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<!-- CreationDate: Mon Dec 22 00:39:22 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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TIFFOpen, TIFFFdOpen, TIFFClientOpen - open a <small>TIFF</small> file for reading or writing</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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<pre><b>#include <tiffio.h>
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TIFF* TIFFOpen(const char* filename, const char* mode)
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TIFF* TIFFFdOpen(const int fd, const char* filename, const char* mode)
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typedef tsize_t (*TIFFReadWriteProc)(thandle_t, tdata_t, tsize_t);
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typedef toff_t (*TIFFSeekProc)(thandle_t, toff_t, int);
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typedef int (*TIFFCloseProc)(thandle_t);
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typedef toff_t (*TIFFSizeProc)(thandle_t);
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typedef int (*TIFFMapFileProc)(thandle_t, tdata_t*, toff_t*);
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typedef void (*TIFFUnmapFileProc)(thandle_t, tdata_t, toff_t);
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TIFF* TIFFClientOpen(const char* filename, const char* mode, thandle_t clientdata,
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TIFFReadWriteProc readproc, TIFFReadWriteProc writeproc, TIFFSeekProc seekproc,
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TIFFCloseProc closeproc, TIFFSizeProc sizeproc, TIFFMapFileProc mapproc,
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TIFFUnmapFileProc unmapproc)
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</b></pre></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>TIFFOpen</i> opens a <small>TIFF</small> file whose name
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is <i>filename</i> and returns a handle to be used in
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subsequent calls to routines in <i>libtiff</i>. If the open
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operation fails, then zero is returned. The <i>mode</i>
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parameter specifies if the file is to be opened for reading
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(``r''), writing (``w''), or appending (``a'') and,
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optionally, whether to override certain default aspects of
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library operation (see below). When a file is opened for
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appending, existing data will not be touched; instead new
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data will be written as additional subfiles. If an existing
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file is opened for writing, all previous data is
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overwritten.</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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If a file is opened for reading, the first
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<small>TIFF</small> directory in the file is automatically
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read (also see <i>TIFFSetDirectory</i>(3T) for reading
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directories other than the first). If a file is opened for
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writing or appending, a default directory is automatically
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created for writing subsequent data. This directory has all
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the default values specified in <small>TIFF</small> Revision
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6.0: <i>BitsPerSample</i>=1, <i>ThreshHolding</i>=bilevel
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art scan, <i>FillOrder</i>=1 (most significant bit of each
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data byte is filled first), <i>Orientation</i>=1 (the 0th
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row represents the visual top of the image, and the 0th
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column represents the visual left hand side),
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<i>SamplesPerPixel</i>=1, <i>RowsPerStrip</i>=infinity,
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<i>ResolutionUnit</i>=2 (inches), and <i>Compression</i>=1
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(no compression). To alter these values, or to define values
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for additional fields, <i>TIFFSetField</i>(3T) must be
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used.</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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<i>TIFFFdOpen</i> is like <i>TIFFOpen</i> except that it
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opens a <small>TIFF</small> file given an open file
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descriptor <i>fd</i>. The file's name and mode must reflect
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that of the open descriptor. The object associated with the
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file descriptor <b>must support random
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access</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="10%"></td><td width="90%">
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<i>TIFFClientOpen</i> is like <i>TIFFOpen</i> except that
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the caller supplies a collection of functions that the
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library will use to do <small>UNIX</small> -like I/O
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operations. The <i>readproc</i> and <i>writeproc</i> are
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called to read and write data at the current file position.
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<i>seekproc</i> is called to change the current file
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position a la <i>lseek</i>(2). <i>closeproc</i> is invoked
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to release any resources associated with an open file.
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<i>sizeproc</i> is invoked to obtain the size in bytes of a
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file. <i>mapproc</i> and <i>unmapproc</i> are called to map
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and unmap a file's contents in memory; c.f. <i>mmap</i>(2)
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and <i>munmap</i>(2). The <i>clientdata</i> parameter is an
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opaque ``handle'' passed to the client-specified routines
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passed as parameters to <i>TIFFClientOpen</i>.</td></table>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</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 open mode parameter can include the following flags in
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addition to the ``r'', ``w'', and ``a'' flags. Note however
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that option flags must follow the read-write-append
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specification.</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>l</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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When creating a new file force information be written with
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Little-Endian byte order (but see below). By default the
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library will create new files using the native
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<small>CPU</small> byte order.</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>b</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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When creating a new file force information be written with
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Big-Endian byte order (but see below). By default the
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library will create new files using the native
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<small>CPU</small> byte order.</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>L</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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Force image data that is read or written to be treated with
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bits filled from Least Significant Bit ( <small>LSB</small>
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) to Most Significant Bit ( <small>MSB</small> ). Note that
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this is the opposite to the way the library has worked from
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its inception.</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>B</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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Force image data that is read or written to be treated with
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bits filled from Most Significant Bit ( <small>MSB</small> )
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to Least Significant Bit ( <small>LSB</small> ); this is the
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default.</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>H</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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Force image data that is read or written to be treated with
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bits filled in the same order as the native
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<small>CPU.</small></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>M</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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Enable the use of memory-mapped files for images opened
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read-only. If the underlying system does not support
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memory-mapped files or if the specific image being opened
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cannot be memory-mapped then the library will fallback to
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using the normal system interface for reading information.
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By default the library will attempt to use memory-mapped
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files.</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>m</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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Disable the use of memory-mapped files.</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>C</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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Enable the use of ``strip chopping'' when reading images
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that are comprised of a single strip or tile of uncompressed
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data. Strip chopping is a mechanism by which the library
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will automatically convert the single-strip image to
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multiple strips, each of which has about 8 Kilobytes of
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data. This facility can be useful in reducing the amount of
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memory used to read an image because the library normally
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reads each strip in its entirety. Strip chopping does
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however alter the apparent contents of the image because
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when an image is divided into multiple strips it looks as
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though the underlying file contains multiple separate
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strips. Finally, note that default handling of strip
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chopping is a compile-time configuration parameter. The
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default behaviour, for backwards compatibility, is to enable
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strip chopping.</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>c</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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Disable the use of strip chopping when reading
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images.</td></table>
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2002-10-07 09:47:36 -04:00
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<a name="BYTE ORDER"></a>
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<h2>BYTE ORDER</h2>
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2003-11-27 10:07:01 -05:00
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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 <small>TIFF</small> specification (<b>all versions</b>)
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states that compliant readers <i>must be capable of reading
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images written in either byte order</i>. Nonetheless some
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software that claims to support the reading of
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<small>TIFF</small> images is incapable of reading images in
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anything but the native <small>CPU</small> byte order on
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2002-10-07 09:47:36 -04:00
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which the software was written. (Especially notorious are
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applications written to run on Intel-based machines.) By
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default the library will create new files with the native
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byte-order of the <small>CPU</small> on which the
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application is run. This ensures optimal performance and is
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portable to any application that conforms to the TIFF
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specification. To force the library to use a specific
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2003-11-27 10:07:01 -05:00
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byte-order when creating a new file the ``b'' and ``l''
|
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option flags may be included in the call to open a file; for
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example, ``wb'' or ``wl''.</td></table>
|
2002-10-07 09:47:36 -04:00
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
|
2003-11-27 10:07:01 -05:00
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<table width="100%" border=0 rules="none" frame="void"
|
2002-10-07 09:47:36 -04:00
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cols="2" cellspacing="0" cellpadding="0">
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|
<tr valign="top" align="left">
|
2003-11-27 10:07:01 -05:00
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<td width="10%"></td><td width="90%">
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|
Upon successful completion <i>TIFFOpen</i>,
|
2002-10-07 09:47:36 -04:00
|
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|
<i>TIFFFdOpen</i>, and <i>TIFFClientOpen</i> return a
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|
<small>TIFF</small> pointer. Otherwise, NULL is
|
2003-11-27 10:07:01 -05:00
|
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|
returned.</td></table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="DIAGNOSTICS"></a>
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|
|
<h2>DIAGNOSTICS</h2>
|
2003-11-27 10:07:01 -05:00
|
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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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|
|
All error messages are directed to the <i>TIFFError</i>(3T)
|
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|
|
|
routine. Likewise, warning messages are directed to the
|
|
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|
|
<i>TIFFWarning</i>(3T) routine.</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>"%s": Bad mode</b>. The specified <i>mode</i>
|
|
|
|
|
parameter was not one of ``r'' (read), ``w'' (write), or
|
|
|
|
|
``a'' (append).</td></table>
|
|
|
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
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|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="10%"></td><td width="90%">
|
|
|
|
|
<b>%s: Cannot open</b>. <i>TIFFOpen</i>() was unable to open
|
|
|
|
|
the specified filename for read/writing.</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>Cannot read TIFF header</b>. An error occurred while
|
|
|
|
|
attempting to read the header 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>Error writing TIFF header</b>. An error occurred while
|
|
|
|
|
writing the default header information for a new
|
|
|
|
|
file.</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>Not a TIFF file, bad magic number %d (0x%x)</b>. The
|
2002-10-07 09:47:36 -04:00
|
|
|
magic number in the header was not (hex) 0x4d4d or (hex)
|
2003-11-27 10:07:01 -05:00
|
|
|
0x4949.</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>Not a TIFF file, bad version number %d (0x%x)</b>. The
|
|
|
|
|
version field in the header was not 42
|
|
|
|
|
(decimal).</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>Cannot append to file that has opposite byte
|
2002-10-07 09:47:36 -04:00
|
|
|
ordering</b>. A file with a byte ordering opposite to the
|
|
|
|
|
native byte ordering of the current machine was opened for
|
2003-11-27 10:07:01 -05:00
|
|
|
appending (``a''). This is a limitation of the
|
|
|
|
|
library.</td></table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="SEE ALSO"></a>
|
|
|
|
|
<h2>SEE ALSO</h2>
|
2003-11-27 10:07:01 -05:00
|
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2002-10-07 09:47:36 -04:00
|
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
2003-11-27 10:07:01 -05:00
|
|
|
<td width="10%"></td><td width="90%">
|
|
|
|
|
<i>libtiff</i>(3T), <i>TIFFClose</i>(3T)</td></table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<hr>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
