log10RGB(512kb) vs RGBM(1024kb), same res. log10RGB info: If your brightest bixel in your HDR image is >= 10 then K is 1.0 since log10 (10) = 1. (which means you already used all 0-1 interval). In this case the first image is the worst case scenario.
Log10RGB might not save performance but it saves memory. Download these 2 images: http://seenax.com/images/DXT1_log10RGB.dds http://seenax.com/images/DXT5_log10RGB.dds You will notice that DXT1 has 512KB unlike DXT5 which has 1024KB, but the RGB channels are absolutely IDENTICAL. The only difference is that DXT1 has no…