http://tech-artists.org/wiki/DDS#DXT
I wanted to add some stuff here, but before I started editing mercilessly I wanted to get some feedback…
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I’m pretty sure DXT is compressed in 4x4 blocks, not 2x2.
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“All DXT algorithms are supposed to compress textures with the same algorithm for the color component”… not exactly true, i.e. DXT1 is different bit depth per pixel than 2/3/4/5.
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My apologies to Ben Mathis, but his article is chock full of inaccuracies, shouldn’t be used as a source IMO, nor is it helpful to link to since the examples aren’t created with an understanding of the algorithms involved. Some better info…
http://wiki.beyondunreal.com/Legacy:DXT (not entirely accurate)
http://udn.epicgames.com/Two/TextureComparison.html
I’m hoping to get some time to edit, but I’m also pretty busy looking for work.