The Witcher engine wants the following formats for textures: Save DXT1 Base Texture as 2D RGB 4 bpp NoAlpha but with Mipmaps Save DXT1 Bumpmaps as Volume Texture RGB 4 bpp NoAlpha but with Mipmaps Save DXT1 Specularmaps as 2D Texture RGB 4 bpp NoAlpha but wit Mipmaps Save DXT5 Base Texture as 2D ARGB 8 bpp | interpolated alpha and with Mipmaps Save DXT5 Bumpmaps as Volume Texture ARGB 8 bpp | interpolated alpha and with Mipmaps Save DXT5 Specular Maps as 2D Texture ARGB 8 bpp | interpolated alpha and with Mipmaps Photo shop is suitable for it best of all. Gimp should also function(work), indeed, the alpha channel is falsified with DXT5. By the way, some Bumpmaps must be given(be) only in 1024x1024 or 512x512, otherwise there is colour defect. Check so always only the original file! Greetz