source: trunk/src/3rdparty/libtiff/html/man/TIFFReadRGBAImage.3tiff.html

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1<!-- Creator : groff version 1.18.1 -->
2<!-- CreationDate: Fri Jul 13 17:43:16 2007 -->
3<html>
4<head>
5<meta name="generator" content="groff -Thtml, see www.gnu.org">
6<meta name="Content-Style" content="text/css">
7<title>TIFFReadRGBAImage</title>
8</head>
9<body>
10
11<h1 align=center>TIFFReadRGBAImage</h1>
12<a href="#NAME">NAME</a><br>
13<a href="#SYNOPSIS">SYNOPSIS</a><br>
14<a href="#DESCRIPTION">DESCRIPTION</a><br>
15<a href="#NOTES">NOTES</a><br>
16<a href="#RETURN VALUES">RETURN VALUES</a><br>
17<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
18<a href="#SEE ALSO">SEE ALSO</a><br>
19
20<hr>
21<a name="NAME"></a>
22<h2>NAME</h2>
23<!-- INDENTATION -->
24<table width="100%" border=0 rules="none" frame="void"
25 cols="2" cellspacing="0" cellpadding="0">
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27<td width="8%"></td>
28<td width="91%">
29<p>TIFFReadRGBAImage, TIFFReadRGBAImageOriented &minus; read
30and decode an image into a fixed-format raster</p>
31</td>
32</table>
33<a name="SYNOPSIS"></a>
34<h2>SYNOPSIS</h2>
35<!-- INDENTATION -->
36<table width="100%" border=0 rules="none" frame="void"
37 cols="2" cellspacing="0" cellpadding="0">
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39<td width="8%"></td>
40<td width="91%">
41<p><b>#include &lt;tiffio.h&gt;</b></p>
42<!-- INDENTATION -->
43<p><b>#define TIFFGetR(abgr) ((abgr) &amp; 0xff)<br>
44#define TIFFGetG(abgr) (((abgr) &gt;&gt; 8) &amp; 0xff)<br>
45#define TIFFGetB(abgr) (((abgr) &gt;&gt; 16) &amp; 0xff)<br>
46#define TIFFGetA(abgr) (((abgr) &gt;&gt; 24) &amp;
470xff)</b></p>
48<!-- INDENTATION -->
49<p><b>int TIFFReadRGBAImage(TIFF *</b><i>tif</i><b>,
50uint32</b> <i>width</i><b>, uint32</b> <i>height</i><b>,
51uint32 *</b><i>raster</i><b>, int</b>
52<i>stopOnError</i><b>)<br>
53int TIFFReadRGBAImageOriented(TIFF *</b><i>tif</i><b>,
54uint32</b> <i>width</i><b>, uint32</b> <i>height</i><b>,
55uint32 *</b><i>raster</i><b>, int</b> <i>orientation</i><b>,
56int</b> <i>stopOnError</i><b>)</b></p>
57</td>
58</table>
59<a name="DESCRIPTION"></a>
60<h2>DESCRIPTION</h2>
61<!-- INDENTATION -->
62<table width="100%" border=0 rules="none" frame="void"
63 cols="2" cellspacing="0" cellpadding="0">
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65<td width="8%"></td>
66<td width="91%">
67<p><i>TIFFReadRGBAImage</i> reads a strip- or tile-based
68image into memory, storing the result in the user supplied
69<i>raster</i>. The raster is assumed to be an array of
70<i>width</i> times <i>height</i> 32-bit entries, where
71<i>width</i> must be less than or equal to the width of the
72image (<i>height</i> may be any non-zero size). If the
73raster dimensions are smaller than the image, the image data
74is cropped to the raster bounds. If the raster height is
75greater than that of the image, then the image data are
76placed in the lower part of the raster. (Note that the
77raster is assume to be organized such that the pixel at
78location (<i>x</i>,<i>y</i>) is
79<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
80raster origin in the lower-left hand corner.)</p>
81<!-- INDENTATION -->
82<p><i>TIFFReadRGBAImageOriented</i> works like
83<i>TIFFReadRGBAImage</i> with except of that user can
84specify the raster origin position with the
85<i>orientation</i> parameter. Four orientations
86supported:</p>
87</td>
88</table>
89<!-- INDENTATION -->
90<table width="100%" border=0 rules="none" frame="void"
91 cols="2" cellspacing="0" cellpadding="0">
92<tr valign="top" align="left">
93<td width="8%"></td>
94<td width="91%">
95<p><b>ORIENTATION_TOPLEFT</b></p></td>
96</table>
97<!-- INDENTATION -->
98<table width="100%" border=0 rules="none" frame="void"
99 cols="2" cellspacing="0" cellpadding="0">
100<tr valign="top" align="left">
101<td width="19%"></td>
102<td width="80%">
103<p>origin in top-left corner,</p>
104</td>
105</table>
106<!-- INDENTATION -->
107<table width="100%" border=0 rules="none" frame="void"
108 cols="2" cellspacing="0" cellpadding="0">
109<tr valign="top" align="left">
110<td width="8%"></td>
111<td width="91%">
112<p><b>ORIENTATION_TOPRIGHT</b></p></td>
113</table>
114<!-- INDENTATION -->
115<table width="100%" border=0 rules="none" frame="void"
116 cols="2" cellspacing="0" cellpadding="0">
117<tr valign="top" align="left">
118<td width="19%"></td>
119<td width="80%">
120<p>origin in top-right corner,</p>
121</td>
122</table>
123<!-- INDENTATION -->
124<table width="100%" border=0 rules="none" frame="void"
125 cols="2" cellspacing="0" cellpadding="0">
126<tr valign="top" align="left">
127<td width="8%"></td>
128<td width="91%">
129<p><b>ORIENTATION_BOTLEFT</b></p></td>
130</table>
131<!-- INDENTATION -->
132<table width="100%" border=0 rules="none" frame="void"
133 cols="2" cellspacing="0" cellpadding="0">
134<tr valign="top" align="left">
135<td width="19%"></td>
136<td width="80%">
137<p>origin in bottom-left corner and</p>
138</td>
139</table>
140<!-- INDENTATION -->
141<table width="100%" border=0 rules="none" frame="void"
142 cols="2" cellspacing="0" cellpadding="0">
143<tr valign="top" align="left">
144<td width="8%"></td>
145<td width="91%">
146<p><b>ORIENTATION_BOTRIGHT</b></p></td>
147</table>
148<!-- INDENTATION -->
149<table width="100%" border=0 rules="none" frame="void"
150 cols="2" cellspacing="0" cellpadding="0">
151<tr valign="top" align="left">
152<td width="19%"></td>
153<td width="80%">
154<p>origin in bottom-right corner.</p>
155</td>
156</table>
157<!-- INDENTATION -->
158<table width="100%" border=0 rules="none" frame="void"
159 cols="2" cellspacing="0" cellpadding="0">
160<tr valign="top" align="left">
161<td width="8%"></td>
162<td width="91%">
163<p>If you choose <b>ORIENTATION_BOTLEFT</b> result will be
164the same as returned by the <i>TIFFReadRGBAImage.</i></p>
165<!-- INDENTATION -->
166<p>Raster pixels are 8-bit packed red, green, blue, alpha
167samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
168<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
169access individual samples. Images without Associated Alpha
170matting information have a constant Alpha of 1.0 (255).</p>
171<!-- INDENTATION -->
172<p><i>TIFFReadRGBAImage</i> converts non-8-bit images by
173scaling sample values. Palette, grayscale, bilevel,
174<small>CMYK</small> , and YCbCr images are converted to
175<small>RGB</small> transparently. Raster pixels are returned
176uncorrected by any colorimetry information present in the
177directory.</p>
178<!-- INDENTATION -->
179<p>The paramater <i>stopOnError</i> specifies how to act if
180an error is encountered while reading the image. If
181<i>stopOnError</i> is non-zero, then an error will terminate
182the operation; otherwise <i>TIFFReadRGBAImage</i> will
183continue processing data until all the possible data in the
184image have been requested.</p>
185</td>
186</table>
187<a name="NOTES"></a>
188<h2>NOTES</h2>
189<!-- INDENTATION -->
190<table width="100%" border=0 rules="none" frame="void"
191 cols="2" cellspacing="0" cellpadding="0">
192<tr valign="top" align="left">
193<td width="8%"></td>
194<td width="91%">
195<p>In C++ the <i>stopOnError</i> parameter defaults to
1960.</p>
197<!-- INDENTATION -->
198<p>Samples must be either 1, 2, 4, 8, or 16 bits.
199Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
200<i>SamplesPerPixel</i> minus <i>ExtraSamples</i>).</p>
201<!-- INDENTATION -->
202<p>Palettte image colormaps that appear to be incorrectly
203written as 8-bit values are automatically scaled to
20416-bits.</p>
205<!-- INDENTATION -->
206<p><i>TIFFReadRGBAImage</i> is just a wrapper around the
207more general <i>TIFFRGBAImage</i>(3TIFF) facilities.</p>
208</td>
209</table>
210<a name="RETURN VALUES"></a>
211<h2>RETURN VALUES</h2>
212<!-- INDENTATION -->
213<table width="100%" border=0 rules="none" frame="void"
214 cols="2" cellspacing="0" cellpadding="0">
215<tr valign="top" align="left">
216<td width="8%"></td>
217<td width="91%">
218<p>1 is returned if the image was successfully read and
219converted. Otherwise, 0 is returned if an error was
220encountered and <i>stopOnError</i> is zero.</p>
221</td>
222</table>
223<a name="DIAGNOSTICS"></a>
224<h2>DIAGNOSTICS</h2>
225<!-- INDENTATION -->
226<table width="100%" border=0 rules="none" frame="void"
227 cols="2" cellspacing="0" cellpadding="0">
228<tr valign="top" align="left">
229<td width="8%"></td>
230<td width="91%">
231<p>All error messages are directed to the
232<i>TIFFError</i>(3TIFF) routine.</p>
233<!-- INDENTATION -->
234<p><b>Sorry, can not handle %d-bit pictures</b>. The image
235had <i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
236<!-- INDENTATION -->
237<p><b>Sorry, can not handle %d-channel images</b>. The image
238had <i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
239<!-- INDENTATION -->
240<p><b>Missing needed &quot;PhotometricInterpretation&quot;
241tag</b>. The image did not have a tag that describes how to
242display the data.</p>
243<!-- INDENTATION -->
244<p><b>No &quot;PhotometricInterpretation&quot; tag, assuming
245RGB</b>. The image was missing a tag that describes how to
246display it, but because it has 3 or 4 samples/pixel, it is
247assumed to be <small>RGB.</small></p>
248<!-- INDENTATION -->
249<p><b>No &quot;PhotometricInterpretation&quot; tag, assuming
250min-is-black</b>. The image was missing a tag that describes
251how to display it, but because it has 1 sample/pixel, it is
252assumed to be a grayscale or bilevel image.</p>
253<!-- INDENTATION -->
254<p><b>No space for photometric conversion table</b>. There
255was insufficient memory for a table used to convert image
256samples to 8-bit <small>RGB.</small></p>
257<!-- INDENTATION -->
258<p><b>Missing required &quot;Colormap&quot; tag</b>. A
259Palette image did not have a required <i>Colormap</i>
260tag.</p>
261<!-- INDENTATION -->
262<p><b>No space for tile buffer</b>. There was insufficient
263memory to allocate an i/o buffer.</p>
264<!-- INDENTATION -->
265<p><b>No space for strip buffer</b>. There was insufficient
266memory to allocate an i/o buffer.</p>
267<!-- INDENTATION -->
268<p><b>Can not handle format</b>. The image has a format
269(combination of <i>BitsPerSample</i>,
270<i>SamplesPerPixel</i>, and
271<i>PhotometricInterpretation</i>) that
272<i>TIFFReadRGBAImage</i> can not handle.</p>
273<!-- INDENTATION -->
274<p><b>No space for B&amp;W mapping table</b>. There was
275insufficient memory to allocate a table used to map
276grayscale data to <small>RGB.</small></p>
277<!-- INDENTATION -->
278<p><b>No space for Palette mapping table</b>. There was
279insufficient memory to allocate a table used to map data to
2808-bit <small>RGB.</small></p>
281</td>
282</table>
283<a name="SEE ALSO"></a>
284<h2>SEE ALSO</h2>
285<!-- INDENTATION -->
286<table width="100%" border=0 rules="none" frame="void"
287 cols="2" cellspacing="0" cellpadding="0">
288<tr valign="top" align="left">
289<td width="8%"></td>
290<td width="91%">
291<p><b>TIFFOpen</b>(3TIFF), <b>TIFFRGBAImage</b>(3TIFF),
292<b>TIFFReadRGBAStrip</b>(3TIFF),
293<b>TIFFReadRGBATile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
294<!-- INDENTATION -->
295<p>Libtiff library home page:
296<b>http://www.remotesensing.org/libtiff/</b></p>
297</td>
298</table>
299<hr>
300</body>
301</html>
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