32 bit tga and png alpha channel is mixed through out the image. White 3x3
image with top left pixel masked out produces:
--- X is masked
|XXX|
|X X|
|XX |
---
Also scale and no_image have no effect. Full scene:
plane{z, 1
pigment{image_map{tga "alpha.tga" once}}
finish{ambient 1}
translate<-0.5, -0.5, 0>
scale 10 // no effect
no_image // no effect
}
