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castano 2009-06-14 22:31:43 +00:00
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@ -8,7 +8,7 @@ A simple way of obtaining higher quality compression is also using the YCoCg col
[http://www.humus.ca Emil Persson (aka Humus)] also has [http://www.humus.ca/index.php?page=3D&ID=68 a demo] that implements a similar idea, but using YCbCr color space instead. He is actually using two textures, either one ATI1N (BC4/DXT5A) texture to store the luma (Y) and one ATI2N (BC5/3Dc) texture to store the chroma (!CbCr), or one DXT1 texture to store the luma and one DXT5 (really DXT5nm) texture to store the chroma. The second texture that stores the chroma is a quarter the size to achieve a compression to 6 bits per pixel, as opposed to 8 bits per pixel for YCoCg DXT5. As shown in the figure below, the compression quality is not as good as YCoCg-DXT5. It also has lower performance, since it requires two texture lookups.
[http://groups.google.com/group/nvidia-texture-tools/web/humus.png]
[http://code.google.com/p/nvidia-texture-tools/source/browse/wiki/imgs/humus.png]
_Graph courtesy of J.M.P. van Waveren._
@ -37,5 +37,4 @@ The basic idea is to compress a texture once, compute the difference between the
http://research.microsoft.com/research/pubs/view.aspx?tr_id=1198
https://www.cmpevents.com/GD08/a.asp?option=C&V=11&SessID=6221
https://www.cmpevents.com/GD08/a.asp?option=C&V=11&SessID=6221