Sounds like colour management, I know gimp supports colour management both monitor and working space (rgb) profiles.
Which does Iweb and preview use?
Up to now I havent had any problems like this but im using windows and imageviewer and i work in standard sRGB workspace.
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You cant fool all of the people all of the time, some of the time all of the people will some of time but not all of the time as some of the time all of the people will some of the time but all of the people will not all of the time  !!
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