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Let's accept that a healthy human eye, and the brain that processes its input are capable of distinguishing more shades than 8bitsx3colors can produce. There are essentially 2 classes of viewing systems for our images: Transmitted light, a good example being a good monitor of some kind. A print, reflecting the image in the presence of illumination. To the best of my understanding, neither a color print, (whether chemical or inkjet) nor a monitor, whether CRT or LCD (or plasma display) have a gamut that exceeds the 8-bit image. If this is so, then the best/only(?) reason for going to 16 bits per primary color is to have spare pixels to maintain the quality of the image through the editing/optimization process, before dropping down to 8 bits for display. Am I wrong in this? If so, I'm sure I'm not the only one who'd like to know wherein. Hersch At 10:07 PM 03/02/2002 -0800, you wrote: >on 3/2/02 8:38, David Chien at firstname.lastname@example.org wrote: > > > Basically, the more bits you have, the more colors you can reproduce or > > use within your files. > > > > Because bits refer to the binary bits used in a computer, you can > > calculate the number of colors you have total under each system. > > > > eg. 8 bits = 2^8 (2 raised to the power of 8) = 256 shades per color > > R, G, B (red, green, blue, the three colors used in emmissive display > > systems to create all other colors). > > > > 256*256*256 (rgb) = 16 million colors > > > > 16 bits = 2^16 = 65536 shades per R, G, B color > > > > 65536^3 (rgb) = 281 trillion colors > ><-snip-> > >David, > >Thank you for a lucid, straightforward answer... really! > >I also want to say thanks for not going into a verses versus versus thing. > >Kind regards, > > ~John > >- >Turn off HTML mail features. Keep quoted material short. Use accurate >subject lines. http://www.leben.com/lists for list instructions. - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.