but with the alpha in the bottom 8 bits rather than the top. For example, 808000FF would be Red and Green:50.2%, Blue:0% and Alpha:100%, a brown. This is what you would get if RGBA8888 data was read as words on these machines. It is used in Portable Arbitrary Map and in FLTK, but in general it is rare. The bytes are stored in memory on a little-endian machine in the order ABGR. See also Portable Network Graphics References External links Alpha transparency on W3C PNG specification RGBA Colors – Preview page with implementation info on CSS3.info Color space