The basics: FSX Acceleration, Windows XP
Using DTXBmp and Paint.net, i've been repainting various texture for quite some time. lately i've noticed there have been instances when I try a new texture, it's absurdly reflective and the alpha channel is now CONSIDERABLY darker then what I had saved just minutes ago.
I'm saving in Extended BMP format 32bit 888-8 primarily to eliminate any quality degradation since i'm always making slight adjustments to most textures. (Haven't tried saving in DDS because most files are bmp and problem free as well.)
This problem doesn't happen every time so I'm thinking there's something within the settings of either Paint.net or DXTBmp that i'm unable to pin-point.
This is what happens to an alpha channel that's been adjusted, it was a rather faint grey before, you can see the heart of the texture is almost pure black.