|
0
|
1 |
<!-- Creator : groff version 1.18.1 -->
|
|
|
2 |
<!-- CreationDate: Mon Mar 13 18:03:10 2006 -->
|
|
|
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>TIFFReadRGBAStrip</title>
|
|
|
8 |
</head>
|
|
|
9 |
<body>
|
|
|
10 |
|
|
|
11 |
<h1 align=center>TIFFReadRGBAStrip</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">
|
|
|
26 |
<tr valign="top" align="left">
|
|
|
27 |
<td width="8%"></td>
|
|
|
28 |
<td width="91%">
|
|
|
29 |
<p>TIFFReadRGBAStrip − read and decode an image strip
|
|
|
30 |
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">
|
|
|
38 |
<tr valign="top" align="left">
|
|
|
39 |
<td width="8%"></td>
|
|
|
40 |
<td width="91%">
|
|
|
41 |
<p><b>#include <tiffio.h></b></p>
|
|
|
42 |
<!-- INDENTATION -->
|
|
|
43 |
<p><b>#define TIFFGetR(abgr) ((abgr) & 0xff)<br>
|
|
|
44 |
#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff)<br>
|
|
|
45 |
#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)<br>
|
|
|
46 |
#define TIFFGetA(abgr) (((abgr) >> 24) &
|
|
|
47 |
0xff)</b></p>
|
|
|
48 |
<!-- INDENTATION -->
|
|
|
49 |
<p><b>int TIFFReadRGBAStrip(TIFF *</b><i>tif</i><b>,
|
|
|
50 |
uint32</b> <i>row</i><b>, uint32
|
|
|
51 |
*</b><i>raster</i><b>)</b></p>
|
|
|
52 |
</td>
|
|
|
53 |
</table>
|
|
|
54 |
<a name="DESCRIPTION"></a>
|
|
|
55 |
<h2>DESCRIPTION</h2>
|
|
|
56 |
<!-- INDENTATION -->
|
|
|
57 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
58 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
59 |
<tr valign="top" align="left">
|
|
|
60 |
<td width="8%"></td>
|
|
|
61 |
<td width="91%">
|
|
|
62 |
<p><i>TIFFReadRGBAStrip</i> reads a single strip of a
|
|
|
63 |
strip-based image into memory, storing the result in the
|
|
|
64 |
user supplied RGBA <i>raster</i>. The raster is assumed to
|
|
|
65 |
be an array of width times rowsperstrip 32-bit entries,
|
|
|
66 |
where width is the width of the image (TIFFTAG_IMAGEWIDTH)
|
|
|
67 |
and rowsperstrip is the maximum lines in a strip
|
|
|
68 |
(TIFFTAG_ROWSPERSTRIP).</p>
|
|
|
69 |
<!-- INDENTATION -->
|
|
|
70 |
<p>The <i>row</i> value should be the row of the first row
|
|
|
71 |
in the strip (strip * rowsperstrip, zero based).</p>
|
|
|
72 |
<!-- INDENTATION -->
|
|
|
73 |
<p>Note that the raster is assume to be organized such that
|
|
|
74 |
the pixel at location (<i>x</i>,<i>y</i>) is
|
|
|
75 |
<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
|
|
|
76 |
raster origin in the <i>lower-left hand corner</i> of the
|
|
|
77 |
strip. That is bottom to top organization. When reading a
|
|
|
78 |
partial last strip in the file the last line of the image
|
|
|
79 |
will begin at the beginning of the buffer.</p>
|
|
|
80 |
<!-- INDENTATION -->
|
|
|
81 |
<p>Raster pixels are 8-bit packed red, green, blue, alpha
|
|
|
82 |
samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
|
|
|
83 |
<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
|
|
|
84 |
access individual samples. Images without Associated Alpha
|
|
|
85 |
matting information have a constant Alpha of 1.0 (255).</p>
|
|
|
86 |
<!-- INDENTATION -->
|
|
|
87 |
<p>See the <i>TIFFRGBAImage</i>(3TIFF) page for more details
|
|
|
88 |
on how various image types are converted to RGBA values.</p>
|
|
|
89 |
</td>
|
|
|
90 |
</table>
|
|
|
91 |
<a name="NOTES"></a>
|
|
|
92 |
<h2>NOTES</h2>
|
|
|
93 |
<!-- INDENTATION -->
|
|
|
94 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
95 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
96 |
<tr valign="top" align="left">
|
|
|
97 |
<td width="8%"></td>
|
|
|
98 |
<td width="91%">
|
|
|
99 |
<p>Samples must be either 1, 2, 4, 8, or 16 bits.
|
|
|
100 |
Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
|
|
|
101 |
<i>SamplesPerPixel</i> minus <i>ExtraSamples</i>).</p>
|
|
|
102 |
<!-- INDENTATION -->
|
|
|
103 |
<p>Palette image colormaps that appear to be incorrectly
|
|
|
104 |
written as 8-bit values are automatically scaled to
|
|
|
105 |
16-bits.</p>
|
|
|
106 |
<!-- INDENTATION -->
|
|
|
107 |
<p><i>TIFFReadRGBAStrip</i> is just a wrapper around the
|
|
|
108 |
more general <i>TIFFRGBAImage</i>(3TIFF) facilities.
|
|
|
109 |
It’s main advantage over the similar
|
|
|
110 |
<i>TIFFReadRGBAImage()</i> function is that for large images
|
|
|
111 |
a single buffer capable of holding the whole image
|
|
|
112 |
doesn’t need to be allocated, only enough for one
|
|
|
113 |
strip. The <i>TIFFReadRGBATile()</i> function does a similar
|
|
|
114 |
operation for tiled images.</p>
|
|
|
115 |
</td>
|
|
|
116 |
</table>
|
|
|
117 |
<a name="RETURN VALUES"></a>
|
|
|
118 |
<h2>RETURN VALUES</h2>
|
|
|
119 |
<!-- INDENTATION -->
|
|
|
120 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
121 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
122 |
<tr valign="top" align="left">
|
|
|
123 |
<td width="8%"></td>
|
|
|
124 |
<td width="91%">
|
|
|
125 |
<p>1 is returned if the image was successfully read and
|
|
|
126 |
converted. Otherwise, 0 is returned if an error was
|
|
|
127 |
encountered.</p>
|
|
|
128 |
</td>
|
|
|
129 |
</table>
|
|
|
130 |
<a name="DIAGNOSTICS"></a>
|
|
|
131 |
<h2>DIAGNOSTICS</h2>
|
|
|
132 |
<!-- INDENTATION -->
|
|
|
133 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
134 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
135 |
<tr valign="top" align="left">
|
|
|
136 |
<td width="8%"></td>
|
|
|
137 |
<td width="91%">
|
|
|
138 |
<p>All error messages are directed to the
|
|
|
139 |
<i>TIFFError</i>(3TIFF) routine.</p>
|
|
|
140 |
<!-- INDENTATION -->
|
|
|
141 |
<p><b>Sorry, can not handle %d-bit pictures</b>. The image
|
|
|
142 |
had <i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
|
|
|
143 |
<!-- INDENTATION -->
|
|
|
144 |
<p><b>Sorry, can not handle %d-channel images</b>. The image
|
|
|
145 |
had <i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
|
|
|
146 |
<!-- INDENTATION -->
|
|
|
147 |
<p><b>Missing needed "PhotometricInterpretation"
|
|
|
148 |
tag</b>. The image did not have a tag that describes how to
|
|
|
149 |
display the data.</p>
|
|
|
150 |
<!-- INDENTATION -->
|
|
|
151 |
<p><b>No "PhotometricInterpretation" tag, assuming
|
|
|
152 |
RGB</b>. The image was missing a tag that describes how to
|
|
|
153 |
display it, but because it has 3 or 4 samples/pixel, it is
|
|
|
154 |
assumed to be <small>RGB.</small></p>
|
|
|
155 |
<!-- INDENTATION -->
|
|
|
156 |
<p><b>No "PhotometricInterpretation" tag, assuming
|
|
|
157 |
min-is-black</b>. The image was missing a tag that describes
|
|
|
158 |
how to display it, but because it has 1 sample/pixel, it is
|
|
|
159 |
assumed to be a grayscale or bilevel image.</p>
|
|
|
160 |
<!-- INDENTATION -->
|
|
|
161 |
<p><b>No space for photometric conversion table</b>. There
|
|
|
162 |
was insufficient memory for a table used to convert image
|
|
|
163 |
samples to 8-bit <small>RGB.</small></p>
|
|
|
164 |
<!-- INDENTATION -->
|
|
|
165 |
<p><b>Missing required "Colormap" tag</b>. A
|
|
|
166 |
Palette image did not have a required <i>Colormap</i>
|
|
|
167 |
tag.</p>
|
|
|
168 |
<!-- INDENTATION -->
|
|
|
169 |
<p><b>No space for tile buffer</b>. There was insufficient
|
|
|
170 |
memory to allocate an i/o buffer.</p>
|
|
|
171 |
<!-- INDENTATION -->
|
|
|
172 |
<p><b>No space for strip buffer</b>. There was insufficient
|
|
|
173 |
memory to allocate an i/o buffer.</p>
|
|
|
174 |
<!-- INDENTATION -->
|
|
|
175 |
<p><b>Can not handle format</b>. The image has a format
|
|
|
176 |
(combination of <i>BitsPerSample</i>,
|
|
|
177 |
<i>SamplesPerPixel</i>, and
|
|
|
178 |
<i>PhotometricInterpretation</i>) that
|
|
|
179 |
<i>TIFFReadRGBAImage</i> can not handle.</p>
|
|
|
180 |
<!-- INDENTATION -->
|
|
|
181 |
<p><b>No space for B&W mapping table</b>. There was
|
|
|
182 |
insufficient memory to allocate a table used to map
|
|
|
183 |
grayscale data to <small>RGB.</small></p>
|
|
|
184 |
<!-- INDENTATION -->
|
|
|
185 |
<p><b>No space for Palette mapping table</b>. There was
|
|
|
186 |
insufficient memory to allocate a table used to map data to
|
|
|
187 |
8-bit <small>RGB.</small></p>
|
|
|
188 |
</td>
|
|
|
189 |
</table>
|
|
|
190 |
<a name="SEE ALSO"></a>
|
|
|
191 |
<h2>SEE ALSO</h2>
|
|
|
192 |
<!-- INDENTATION -->
|
|
|
193 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
194 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
195 |
<tr valign="top" align="left">
|
|
|
196 |
<td width="8%"></td>
|
|
|
197 |
<td width="91%">
|
|
|
198 |
<p><b>TIFFOpen</b>(3TIFF), <b>TIFFRGBAImage</b>(3TIFF),
|
|
|
199 |
<b>TIFFReadRGBAImage</b>(3TIFF),
|
|
|
200 |
<b>TIFFReadRGBATile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
|
|
|
201 |
<!-- INDENTATION -->
|
|
|
202 |
<p>Libtiff library home page:
|
|
|
203 |
<b>http://www.remotesensing.org/libtiff/</b></p>
|
|
|
204 |
</td>
|
|
|
205 |
</table>
|
|
|
206 |
<hr>
|
|
|
207 |
</body>
|
|
|
208 |
</html>
|