CompuServe Messages

Hi John, << the formula.. >> There is nothing special about 3DS's use of gamma. The forumla is simply: (1.0 / gamma) (x / 255.0) * 255 where x is a value between 0 and 255 and the result is a number between 0 and 255 (if you are dealing with 8 bit deep intensities). Here is a simple verification of this. With 3DS's default gamma value of 1.8 go into 3DS and set the background so that green is set to 128 and then render to your favorite 24 bit image file format. Then with your favorite image file tool you will find that all of the pixels have a green component of 174 (or one different if dither is on). This corresponds to: (1.0 / 1.8) (128 / 255) * 255 = approximately 174