PngSuite - Background colors / GIF-files

bgai4a08 - 8 bit grayscale, alpha, no background chunk, interlaced bgai4a16 - 16 bit grayscale, alpha, no background chunk, interlaced bgan6a08 - 3x8 bits rgb color, alpha, no background chunk bgan6a16 - 3x16 bits rgb color, alpha, no background chunk bgbn4a08 - 8 bit grayscale, alpha, black background chunk bggn4a16 - 16 bit grayscale, alpha, gray background chunk bgwn6a08 - 3x8 bits rgb color, alpha, white background chunk bgyn6a16 - 3x16 bits rgb color, alpha, yellow background chunk

Willem van Schaik, Singapore, March 1998 http://www.schaik.com/wwwillem.html