302 lines
10 KiB
HTML
302 lines
10 KiB
HTML
<!-- Creator : groff version 1.18.1 -->
|
|
<!-- CreationDate: Fri Dec 30 00:55:56 2005 -->
|
|
<html>
|
|
<head>
|
|
<meta name="generator" content="groff -Thtml, see www.gnu.org">
|
|
<meta name="Content-Style" content="text/css">
|
|
<title>TIFFReadRGBAImage</title>
|
|
</head>
|
|
<body>
|
|
|
|
<h1 align=center>TIFFReadRGBAImage</h1>
|
|
<a href="#NAME">NAME</a><br>
|
|
<a href="#SYNOPSIS">SYNOPSIS</a><br>
|
|
<a href="#DESCRIPTION">DESCRIPTION</a><br>
|
|
<a href="#NOTES">NOTES</a><br>
|
|
<a href="#RETURN VALUES">RETURN VALUES</a><br>
|
|
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
|
|
<a href="#SEE ALSO">SEE ALSO</a><br>
|
|
|
|
<hr>
|
|
<a name="NAME"></a>
|
|
<h2>NAME</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p>TIFFReadRGBAImage, TIFFReadRGBAImageOriented − read
|
|
and decode an image into a fixed-format raster</p>
|
|
</td>
|
|
</table>
|
|
<a name="SYNOPSIS"></a>
|
|
<h2>SYNOPSIS</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><b>#include <tiffio.h></b></p>
|
|
<!-- INDENTATION -->
|
|
<p><b>#define TIFFGetR(abgr) ((abgr) & 0xff)<br>
|
|
#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff)<br>
|
|
#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)<br>
|
|
#define TIFFGetA(abgr) (((abgr) >> 24) &
|
|
0xff)</b></p>
|
|
<!-- INDENTATION -->
|
|
<p><b>int TIFFReadRGBAImage(TIFF *</b><i>tif</i><b>,
|
|
u_long</b> <i>width</i><b>, u_long</b> <i>height</i><b>,
|
|
u_long *</b><i>raster</i><b>, int</b>
|
|
<i>stopOnError</i><b>)<br>
|
|
int TIFFReadRGBAImageOriented(TIFF *</b><i>tif</i><b>,
|
|
u_long</b> <i>width</i><b>, u_long</b> <i>height</i><b>,
|
|
u_long *</b><i>raster</i><b>, int</b> <i>orientation</i><b>,
|
|
int</b> <i>stopOnError</i><b>)</b></p>
|
|
</td>
|
|
</table>
|
|
<a name="DESCRIPTION"></a>
|
|
<h2>DESCRIPTION</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><i>TIFFReadRGBAImage</i> reads a strip- or tile-based
|
|
image into memory, storing the result in the user supplied
|
|
<i>raster</i>. The raster is assumed to be an array of
|
|
<i>width</i> times <i>height</i> 32-bit entries, where
|
|
<i>width</i> must be less than or equal to the width of the
|
|
image (<i>height</i> may be any non-zero size). If the
|
|
raster dimensions are smaller than the image, the image data
|
|
is cropped to the raster bounds. If the raster height is
|
|
greater than that of the image, then the image data are
|
|
placed in the lower part of the raster. (Note that the
|
|
raster is assume to be organized such that the pixel at
|
|
location (<i>x</i>,<i>y</i>) is
|
|
<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
|
|
raster origin in the lower-left hand corner.)</p>
|
|
<!-- INDENTATION -->
|
|
<p><i>TIFFReadRGBAImageOriented</i> works like
|
|
<i>TIFFReadRGBAImage</i> with except of that user can
|
|
specify the raster origin position with the
|
|
<i>orientation</i> parameter. Four orientations
|
|
supported:</p>
|
|
</td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><b>ORIENTATION_TOPLEFT</b></p></td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="19%"></td>
|
|
<td width="80%">
|
|
<p>origin in top-left corner,</p>
|
|
</td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><b>ORIENTATION_TOPRIGHT</b></p></td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="19%"></td>
|
|
<td width="80%">
|
|
<p>origin in top-right corner,</p>
|
|
</td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><b>ORIENTATION_BOTLEFT</b></p></td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="19%"></td>
|
|
<td width="80%">
|
|
<p>origin in bottom-left corner and</p>
|
|
</td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><b>ORIENTATION_BOTRIGHT</b></p></td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="19%"></td>
|
|
<td width="80%">
|
|
<p>origin in bottom-right corner.</p>
|
|
</td>
|
|
</table>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p>If you choose <b>ORIENTATION_BOTLEFT</b> result will be
|
|
the same as returned by the <i>TIFFReadRGBAImage.</i></p>
|
|
<!-- INDENTATION -->
|
|
<p>Raster pixels are 8-bit packed red, green, blue, alpha
|
|
samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
|
|
<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
|
|
access individual samples. Images without Associated Alpha
|
|
matting information have a constant Alpha of 1.0 (255).</p>
|
|
<!-- INDENTATION -->
|
|
<p><i>TIFFReadRGBAImage</i> converts non-8-bit images by
|
|
scaling sample values. Palette, grayscale, bilevel,
|
|
<small>CMYK</small> , and YCbCr images are converted to
|
|
<small>RGB</small> transparently. Raster pixels are returned
|
|
uncorrected by any colorimetry information present in the
|
|
directory.</p>
|
|
<!-- INDENTATION -->
|
|
<p>The paramater <i>stopOnError</i> specifies how to act if
|
|
an error is encountered while reading the image. If
|
|
<i>stopOnError</i> is non-zero, then an error will terminate
|
|
the operation; otherwise <i>TIFFReadRGBAImage</i> will
|
|
continue processing data until all the possible data in the
|
|
image have been requested.</p>
|
|
</td>
|
|
</table>
|
|
<a name="NOTES"></a>
|
|
<h2>NOTES</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p>In C++ the <i>stopOnError</i> parameter defaults to
|
|
0.</p>
|
|
<!-- INDENTATION -->
|
|
<p>Samples must be either 1, 2, 4, 8, or 16 bits.
|
|
Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
|
|
<i>SamplesPerPixel</i> minus <i>ExtraSamples</i>).</p>
|
|
<!-- INDENTATION -->
|
|
<p>Palettte image colormaps that appear to be incorrectly
|
|
written as 8-bit values are automatically scaled to
|
|
16-bits.</p>
|
|
<!-- INDENTATION -->
|
|
<p><i>TIFFReadRGBAImage</i> is just a wrapper around the
|
|
more general <i>TIFFRGBAImage</i>(3TIFF) facilities.</p>
|
|
</td>
|
|
</table>
|
|
<a name="RETURN VALUES"></a>
|
|
<h2>RETURN VALUES</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p>1 is returned if the image was successfully read and
|
|
converted. Otherwise, 0 is returned if an error was
|
|
encountered and <i>stopOnError</i> is zero.</p>
|
|
</td>
|
|
</table>
|
|
<a name="DIAGNOSTICS"></a>
|
|
<h2>DIAGNOSTICS</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p>All error messages are directed to the
|
|
<i>TIFFError</i>(3TIFF) routine.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>Sorry, can not handle %d-bit pictures</b>. The image
|
|
had <i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>Sorry, can not handle %d-channel images</b>. The image
|
|
had <i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>Missing needed "PhotometricInterpretation"
|
|
tag</b>. The image did not have a tag that describes how to
|
|
display the data.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No "PhotometricInterpretation" tag, assuming
|
|
RGB</b>. The image was missing a tag that describes how to
|
|
display it, but because it has 3 or 4 samples/pixel, it is
|
|
assumed to be <small>RGB.</small></p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No "PhotometricInterpretation" tag, assuming
|
|
min-is-black</b>. The image was missing a tag that describes
|
|
how to display it, but because it has 1 sample/pixel, it is
|
|
assumed to be a grayscale or bilevel image.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No space for photometric conversion table</b>. There
|
|
was insufficient memory for a table used to convert image
|
|
samples to 8-bit <small>RGB.</small></p>
|
|
<!-- INDENTATION -->
|
|
<p><b>Missing required "Colormap" tag</b>. A
|
|
Palette image did not have a required <i>Colormap</i>
|
|
tag.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No space for tile buffer</b>. There was insufficient
|
|
memory to allocate an i/o buffer.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No space for strip buffer</b>. There was insufficient
|
|
memory to allocate an i/o buffer.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>Can not handle format</b>. The image has a format
|
|
(combination of <i>BitsPerSample</i>,
|
|
<i>SamplesPerPixel</i>, and
|
|
<i>PhotometricInterpretation</i>) that
|
|
<i>TIFFReadRGBAImage</i> can not handle.</p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No space for B&W mapping table</b>. There was
|
|
insufficient memory to allocate a table used to map
|
|
grayscale data to <small>RGB.</small></p>
|
|
<!-- INDENTATION -->
|
|
<p><b>No space for Palette mapping table</b>. There was
|
|
insufficient memory to allocate a table used to map data to
|
|
8-bit <small>RGB.</small></p>
|
|
</td>
|
|
</table>
|
|
<a name="SEE ALSO"></a>
|
|
<h2>SEE ALSO</h2>
|
|
<!-- INDENTATION -->
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
<tr valign="top" align="left">
|
|
<td width="8%"></td>
|
|
<td width="91%">
|
|
<p><b>TIFFOpen</b>(3TIFF), <b>TIFFRGBAImage</b>(3TIFF),
|
|
<b>TIFFReadRGBAStrip</b>(3TIFF),
|
|
<b>TIFFReadRGBATile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
|
|
<!-- INDENTATION -->
|
|
<p>Libtiff library home page:
|
|
<b>http://www.remotesensing.org/libtiff/</b></p>
|
|
</td>
|
|
</table>
|
|
<hr>
|
|
</body>
|
|
</html>
|