My friend is a user of an iMac with a 20 inch screen and his pictures of homes he took in Suffolk, Va weren't coming out quite right.  We found out the problem wasn't him, it was the computer he was using.  The system can only display 262,144 true colors.  The other millions of colors are a trick.  Apple uses a technology that shows similar shades at high speeds to create the illusion of the desired shade.  It works for the most part but you can see colors that don't appear smooth and that can be disconcerting.  I guess you always need to be careful with specs and who they come from.  If the pictures you are taking don't always look right, look at your monitor as well as the camera and the printer.

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