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mayingzhen / nvidia-texture-tools

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option to disable premultiplied alpha when saving DXT1a #130

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
This is a feature request..

I'll be nice to have the option of turning of pre multiplied aplpha for DXT1a 
format

related --
http://code.google.com/p/nvidia-texture-tools/issues/detail?id=86&can=1&q=BC1a&c
olspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Stars

Original issue reported on code.google.com by nis...@gmail.com on 20 Jul 2010 at 8:06

GoogleCodeExporter commented 8 years ago 
There's no way to disable premultiplied alpha for DXT1. That's the way the 
format was designed and there's no way around that. Please, see the links in 
issue 86.

Original comment by cast...@gmail.com on 20 Jul 2010 at 11:28

GoogleCodeExporter commented 8 years ago 
Nvidia's photoshop plugin is able to save 1bit alpha for DXT1a without touching 
the RGB channels.. 
Is there anyway i can get nvcompress to do the same by modifying the source 
files ?

Original comment by nis...@gmail.com on 21 Jul 2010 at 7:20