[tityus]

(...) btw - these options are for GIMP, not Photoshop.

Thanks for the prompt reply. I'll try to sort of my PS problem first. For now, Gimp is plan B.

his problem is shifting RGB values for the texture areas on map_T.tga

Doesn't have to involve multilayer nor flattening. Problem is present even in a solid simple single layer. Imagine one single layer, grayscale big square one, no mask, nothing else. I paint 31 and when I sample the color from "the canvas", it reads 32.

BTW, redko, could you test the example bellow in your PS and see if you experience the same?

- create new single layer grayscale .tga
- paint color 31 (#1f1f1f) - may wanna try also 7 (#070707)
- sample color with eyedropper or info panel

thanks