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7<title>TIFF2RGBA</title>
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11<h1 align=center>TIFF2RGBA</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="#OPTIONS">OPTIONS</a><br>
16<a href="#SEE ALSO">SEE ALSO</a><br>
17
18<hr>
19<a name="NAME"></a>
20<h2>NAME</h2>
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27<p>tiff2rgba &minus; convert a <small>TIFF</small> image to
28RGBA color space</p>
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31<a name="SYNOPSIS"></a>
32<h2>SYNOPSIS</h2>
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39<p><b>tiff2rgba</b> [ <i>options</i> ] <i>input.tif
40output.tif</i></p>
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43<a name="DESCRIPTION"></a>
44<h2>DESCRIPTION</h2>
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51<p><i>Tiff2rgba</i> converts a wide variety of TIFF images
52into an RGBA TIFF image. This includes the ability to
53translate different color spaces and photometric
54interpretation into RGBA, support for alpha blending, and
55translation of many different bit depths into a 32bit RGBA
56image.</p>
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58<p>Internally this program is implemented using the
59<i>TIFFReadRGBAImage()</i> function, and it suffers any
60limitations of that image. This includes limited support for
61&gt; 8 BitsPerSample images, and flaws with some esoteric
62combinations of BitsPerSample, photometric interpretation,
63block organization and planar configuration.</p>
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65<p>The generated images are stripped images with four
66samples per pixel (red, green, blue and alpha) or if the
67<b>&minus;n</b> flag is used, three samples per pixel (red,
68green, and blue). The resulting images are always planar
69configuration contiguous. For this reason, this program is a
70useful utility for transform exotic TIFF files into a form
71ingestible by almost any TIFF supporting software.</p>
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73</table>
74<a name="OPTIONS"></a>
75<h2>OPTIONS</h2>
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82
83<p><b>&minus;c</b></p>
84</td>
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87
88<p>Specify a compression scheme to use when writing image
89data: <b>&minus;c none</b> for no compression (the default),
90<b>&minus;c packbits</b> for the PackBits compression
91algorithm, <b>&minus;c zip</b> for the Deflate compression
92algorithm, <b>&minus;c jpeg</b> for the JPEG compression
93algorithm, and <b>&minus;c lzw</b> for Lempel-Ziv &amp;
94Welch.</p>
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101
102<p><b>&minus;r</b></p>
103</td>
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106
107<p>Write data with a specified number of rows per strip; by
108default the number of rows/strip is selected so that each
109strip is approximately 8 kilobytes.</p>
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116
117<p><b>&minus;b</b></p>
118</td>
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121
122<p>Process the image one block (strip/tile) at a time
123instead of by reading the whole image into memory at once.
124This may be necessary for very large images on systems with
125limited RAM.</p>
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128</td>
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132
133<p><b>&minus;n</b></p>
134</td>
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137
138<p>Drop the alpha component from the output file, producing
139a pure RGB file. Currently this does not work if the
140<b>&minus;b</b> flag is also in effect.</p>
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143</td>
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145<a name="SEE ALSO"></a>
146<h2>SEE ALSO</h2>
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153<p><b>tiff2bw</b>(1), <b>TIFFReadRGBAImage</b>(3t),
154<b>libtiff</b>(3)</p>
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156<p>Libtiff library home page:
157<b>http://www.simplesystems.org/libtiff/</b></p>
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