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<title>TIFFOpen</title>
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</head>
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<body>
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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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<a name="NAME"></a>
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<h2>NAME</h2>
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<p style="margin-left:11%; margin-top: 1em">TIFFOpen,
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TIFFFdOpen, TIFFClientOpen − open a
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<small>TIFF</small> file for reading or writing</p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>#include
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<tiffio.h></b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>TIFF*
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TIFFOpen(const char *</b><i>filename</i><b>, const char
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*</b><i>mode</i><b>) <br>
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TIFF* TIFFFdOpen(const int</b> <i>fd</i><b>, const char
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*</b><i>filename</i><b>, const char
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*</b><i>mode</i><b>)</b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>typedef
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tsize_t (*TIFFReadWriteProc)(thandle_t, tdata_t, tsize_t);
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<br>
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typedef toff_t (*TIFFSeekProc)(thandle_t, toff_t, int); <br>
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typedef int (*TIFFCloseProc)(thandle_t); <br>
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typedef toff_t (*TIFFSizeProc)(thandle_t); <br>
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typedef int (*TIFFMapFileProc)(thandle_t, tdata_t*,
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toff_t*); <br>
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typedef void (*TIFFUnmapFileProc)(thandle_t, tdata_t,
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toff_t);</b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>TIFF*
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TIFFClientOpen(const char *</b><i>filename</i><b>, const
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char *</b><i>mode</i><b>, thandle_t</b>
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<i>clientdata</i><b>, TIFFReadWriteProc</b>
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<i>readproc</i><b>, TIFFReadWriteProc</b>
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<i>writeproc</i><b>, TIFFSeekProc</b> <i>seekproc</i><b>,
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TIFFCloseProc</b> <i>closeproc</i><b>, TIFFSizeProc</b>
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<i>sizeproc</i><b>, TIFFMapFileProc</b> <i>mapproc</i><b>,
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TIFFUnmapFileProc</b> <i>unmapproc</i><b>)</b></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFOpen</i>
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opens a <small>TIFF</small> file whose name is
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<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
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(‘‘w’’), or appending
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(‘‘a’’) and, optionally, whether to
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override certain default aspects of library operation (see
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below). When a file is opened for appending, existing data
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will not be touched; instead new data will be written as
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additional subfiles. If an existing file is opened for
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writing, all previous data is overwritten.</p>
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<p style="margin-left:11%; margin-top: 1em">If a file is
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opened for reading, the first <small>TIFF</small> directory
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in the file is automatically read (also see
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<i>TIFFSetDirectory</i>(3TIFF) for reading directories other
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than the first). If a file is opened for writing or
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appending, a default directory is automatically created for
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writing subsequent data. This directory has all the default
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values specified in <small>TIFF</small> Revision 6.0:
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<i>BitsPerSample</i>=1, <i>ThreshHolding</i>=bilevel art
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scan, <i>FillOrder</i>=1 (most significant bit of each data
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byte is filled first), <i>Orientation</i>=1 (the 0th row
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represents the visual top of the image, and the 0th column
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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>(3TIFF) must be
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used.</p>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFFdOpen</i>
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is like <i>TIFFOpen</i> except that it opens a
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<small>TIFF</small> file given an open file descriptor
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<i>fd</i>. The file’s name and mode must reflect that
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of the open descriptor. The object associated with the file
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descriptor <b>must support random access</b>.</p>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFClientOpen</i>
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is like <i>TIFFOpen</i> except that the caller supplies a
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collection of functions that the library will use to do
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<small>UNIX</small> -like I/O operations. The
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<i>readproc</i> and <i>writeproc</i> are called to read and
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write data at the current file position. <i>seekproc</i> is
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called to change the current file position a la
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<i>lseek</i>(2). <i>closeproc</i> is invoked to release any
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resources associated with an open file. <i>sizeproc</i> is
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invoked to obtain the size in bytes of a file.
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<i>mapproc</i> and <i>unmapproc</i> are called to map and
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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
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client-specified routines passed as parameters to
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<i>TIFFClientOpen</i>.</p>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<p style="margin-left:11%; margin-top: 1em">The open mode
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parameter can include the following flags in addition to the
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‘‘r’’,
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‘‘w’’, and
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‘‘a’’ flags. Note however that
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option flags must follow the read-write-append
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specification.</p>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>l</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">When creating a new
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file force information be written with Little-Endian byte
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order (but see below). By default the library will create
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new files using the native <small>CPU</small> byte
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order.</p> </td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>b</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">When creating a new
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file force information be written with Big-Endian byte order
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(but see below). By default the library will create new
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files using the native <small>CPU</small> byte order.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>L</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Force image data
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that is read or written to be treated with bits filled from
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Least Significant Bit ( <small>LSB</small> ) to Most
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Significant Bit ( <small>MSB</small> ). Note that this is
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the opposite to the way the library has worked from its
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inception.</p> </td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>B</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Force image data
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that is read or written to be treated with bits filled from
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Most Significant Bit ( <small>MSB</small> ) to Least
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Significant Bit ( <small>LSB</small> ); this is the
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default.</p> </td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>H</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Force image data
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that is read or written to be treated with bits filled in
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the same order as the native <small>CPU.</small></p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>M</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Enable the use of
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memory-mapped files for images opened read-only. If the
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underlying system does not support memory-mapped files or if
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the specific image being opened cannot be memory-mapped then
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the library will fallback to using the normal system
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interface for reading information. By default the library
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will attempt to use memory-mapped files.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>m</b></p></td>
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<td width="10%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Disable the use of
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memory-mapped files.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>C</b></p></td>
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<td width="10%"></td>
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2006-01-02 18:50:44 -05:00
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Enable the use of
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‘‘strip chopping’’ when reading
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images that are comprised of a single strip or tile of
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uncompressed data. Strip chopping is a mechanism by which
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the library will automatically convert the single-strip
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image to multiple strips, each of which has about 8
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Kilobytes of data. This facility can be useful in reducing
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the amount of memory used to read an image because the
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library normally reads each strip in its entirety. Strip
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chopping does however alter the apparent contents of the
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image because when an image is divided into multiple strips
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it looks as though the underlying file contains multiple
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separate strips. Finally, note that default handling of
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strip chopping is a compile-time configuration parameter.
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The default behaviour, for backwards compatibility, is to
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enable strip chopping.</p></td>
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2005-03-06 06:11:43 -05:00
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>c</b></p></td>
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<td width="10%"></td>
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2006-01-02 18:50:44 -05:00
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Disable the use of
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strip chopping when reading images.</p></td>
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2005-12-29 17:01:44 -05:00
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<tr valign="top" align="left">
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2006-01-02 18:50:44 -05:00
|
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<td width="11%"></td>
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<td width="1%">
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<p style="margin-top: 1em" valign="top"><b>h</b></p></td>
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<td width="10%"></td>
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2006-01-02 18:50:44 -05:00
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Read TIFF header
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only, do not load the first image directory. That could be
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useful in case of the broken first directory. We can open
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the file and proceed to the other directories.</p></td>
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2005-03-06 06:11:43 -05:00
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</table>
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2006-01-02 18:50:44 -05:00
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2005-03-06 06:11:43 -05:00
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<a name="BYTE ORDER"></a>
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<h2>BYTE ORDER</h2>
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2006-01-02 18:50:44 -05:00
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<p style="margin-left:11%; margin-top: 1em">The
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<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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2005-03-06 06:11:43 -05:00
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which the software was written. (Especially notorious are
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|
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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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byte-order when creating a new file the
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|
‘‘b’’ and
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|
|
‘‘l’’ option flags may be included
|
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|
|
in the call to open a file; for example,
|
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|
|
‘‘wb’’ or
|
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|
|
‘‘wl’’.</p>
|
2006-01-02 18:50:44 -05:00
|
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|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="RETURN VALUES"></a>
|
|
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|
|
<h2>RETURN VALUES</h2>
|
2006-01-02 18:50:44 -05:00
|
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|
|
<p style="margin-left:11%; margin-top: 1em">Upon successful
|
|
|
|
|
completion <i>TIFFOpen</i>, <i>TIFFFdOpen</i>, and
|
|
|
|
|
<i>TIFFClientOpen</i> return a <small>TIFF</small> pointer.
|
|
|
|
|
Otherwise, NULL is returned.</p>
|
|
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|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="DIAGNOSTICS"></a>
|
|
|
|
|
<h2>DIAGNOSTICS</h2>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
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|
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|
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|
|
<p style="margin-left:11%; margin-top: 1em">All error
|
|
|
|
|
messages are directed to the <i>TIFFError</i>(3TIFF)
|
|
|
|
|
routine. Likewise, warning messages are directed to the
|
|
|
|
|
<i>TIFFWarning</i>(3TIFF) routine.</p>
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
<p style="margin-left:11%; margin-top: 1em"><b>"%s":
|
|
|
|
|
Bad mode</b>. The specified <i>mode</i> parameter was not
|
|
|
|
|
one of ‘‘r’’ (read),
|
2005-03-06 06:11:43 -05:00
|
|
|
‘‘w’’ (write), or
|
|
|
|
|
‘‘a’’ (append).</p>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>%s: Cannot
|
|
|
|
|
open</b>. <i>TIFFOpen</i>() was unable to open the specified
|
|
|
|
|
filename for read/writing.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>Cannot read
|
|
|
|
|
TIFF header</b>. An error occurred while attempting to read
|
|
|
|
|
the header information.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>Error
|
|
|
|
|
writing TIFF header</b>. An error occurred while writing the
|
|
|
|
|
default header information for a new file.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>Not a TIFF
|
|
|
|
|
file, bad magic number %d (0x%x)</b>. The magic number in
|
|
|
|
|
the header was not (hex) 0x4d4d or (hex) 0x4949.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>Not a TIFF
|
|
|
|
|
file, bad version number %d (0x%x)</b>. The version field in
|
|
|
|
|
the header was not 42 (decimal).</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>Cannot
|
|
|
|
|
append to file that has opposite byte ordering</b>. A file
|
|
|
|
|
with a byte ordering opposite to the native byte ordering of
|
|
|
|
|
the current machine was opened for appending
|
|
|
|
|
(‘‘a’’). This is a limitation of the
|
|
|
|
|
library.</p>
|
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="SEE ALSO"></a>
|
|
|
|
|
<h2>SEE ALSO</h2>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><i>libtiff</i>(3TIFF),
|
|
|
|
|
<i>TIFFClose</i>(3TIFF)</p>
|
2005-03-06 06:11:43 -05:00
|
|
|
<hr>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
