Sometimes when you are editing, you can't see all the imperfections in an image. That doesn't mean they aren't there, nor does it mean it's not worth taking time to fix them. If you are doing an image that requires perfection, like something destined to be printed large or displayed on a high resolution screen, here is a great technique for finding blemishes you may have missed. This tutorial will show you how to use a curves adjustment layer to double check your work.
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Share you techniques for finding and fixing spots, flaws and blemishes in the comments below!