On 12/14/05, Jon Niehof <[EMAIL PROTECTED]> wrote: > --- sean <[EMAIL PROTECTED]> wrote: > > > Why would it not be: > > > > L = (R + G + B) / 3 > > Because 255 blue is dimmer than 255 green. NTSC standard: > Gray scale intensity = 0.299R + 0.587G + 0.114B
True, although unless you are coding for a 1960's color television, it's probably better to use the sRGB/ITU-R 709 formula: Y = 0.2126R + 0.7152G + 0.0722B. If you're really interested, the finer points of color are explained at http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html Rockwalrus Rockwalrus _______________________________________________ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
