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Keep in mind though: Virtually every computer you view a file on will show it at a slightly different brightness, color tone, etc... Sometimes, the differences can be quite striking.
When you're designing web graphics, never assume anyone will see your images *quite* the same way you do...
Another possibility might be that you're inadvertently using the setting that shows you on a PC what pages would look like on a Mac. Mac view is much lighter... in fact, on photos, I find it impossible to find a setting that will look good on both systems.
I've gotten some *really* screwed up batches of brochures in the past, when I forget to change my profile settings. However, if you're regularly designing for more than one output source (print and web, etc.), the hassle of remembering your profiles is more than worth it when you consider the improvements to output quality.