> Why does PhotoShop use a color gamut smaller than the Standard Human > Observer (CIE xyY chromaticity diamgram)? Photoshop will use whatever color gamut you tell it to use. Selecting a color gamut that is significantly wider than the output devices that you expect to employee (monitor and printer) creates problems in producing useable output. The recommendation is to "convert" the wider gamut to a more contained gamut using the "intents" for the final output. The recommended work flow is to select a color gamut that is relatively well represented in both the monitor and printer and use these for editing. Adobe RGB is one of the most common. You can then "soft proof" on screen if you are planning CMYK output. >Won't this cause a problem for archiving > images (by > artificially limiting gamut, i.e., changing the original image)? Yes any files which are "converted" and "saved" are altered forever. I archive unaltered color files so I may color adjust them as I want in the future. Dick Reed Toskhara Arabians Leicestershire, England www.toskhara.com - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.