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<html><head><title>High-speed Conversion of Floating Point Images to
8-bit</title></head><body bgcolor=black text=#c0c0c0 link=#80c0c0 vlink=#ffc0c0>
<center><h1>High-speed Conversion of Floating Point Images to 8-bit</h1>
<b>Bill Spitzak
<br>Digital Domain</b></center>
<p><i>Copyright © 2002 by Digital Domain and Bill Spitzak. Feel
free to copy or reference these pages in your own documentation,
provided you preserve the copyright notice and authorship information.
<b>The source code is under the <a href=COPYING.html>General Public
License (GPL)</a></b>, but it is also available under other licensing
terms if you desire. Please contact Digital Domain if you wish to use
it under a different license.</i>
<p>My paper describes a method I have developed at <a
href=www.d2.com>Digital Domain</a> to accurately and quickly convert
between "linear floating point" and the more common "sRGB bytes"
representations of the images. The method is simple and fast. It uses
dithering to avoid posterizing, and can be implemented in hardware.
<p>But it appears that there is still a need to explain exactly
what these terms mean, and why this conversion is desirable. Click on each
of these chapters to read my attempts to explain this rather simple,
but for some reason very confusing, subject:
<br><br><br><br>
<ul>
<p><a href=calibrate.html>Calibrate your monitor!</a>
<p><a href=srgb.html>What is sRGB?</a>
<p><a href=whysrgb.html>Why store files in sRGB?</a>
<p><a href=linear.html>What is Linear Floating Point?</a>
<p><a href=composite.html>Why Calculate in Linear Floating Point?</a>
<p><a href=notlinear.html>When does Linear Floating Point not work?</a>
<p><a href=dithering.html>What is dithering?</a>
</ul>
<p>Okay, now it is finally time to talk about my algorithim:
<ul>
<p><a href=sketches_0265.pdf>sketches_0265.pdf</a> - My Siggraph
sketch on the linear <-> sRGB algorithm.
<p><a href=algorithm.html>The algorithm</a>
<p><a href=accuracy.html>Function plots showing the accuracy of this algorithm</a>.
<p><a href=conversion.h>conversion.h</a> - Declarations for sample source
code.
<p><a href=conversion.c>conversion.c</a> - Sample source
code.
<p><a href=cineon.html>Converting Cineon files to Linear Floating Point</a>
</ul>
</body></html>