Posted 10 October 2012 - 11:53 PM
You have full control. The -weight switch allows you to customize the weights of each channel.
For DXT5 compressions, the alpha is always “maximal” compressed. That is it is encoded with the provably most optimal key colors, so it works well with the standard way of storing normal maps with only the green and alpha channels used.
For anything else, the weights of each channel are in your hands.
It also has the option to normalize mipmaps.
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