Can you post the photo so we can see what you are talking about.
Not sure of this is the same as what you have, but when I scan DVD Covers for my DVD Cataloguing program I'm too lazy to take them out of their slipcases. The scans always look a bit milky, because of the plastic, but I've found that Enhance> Auto Smart Tone is ideal for fixing them. And because of the Learning feature of Smart Tone it usually puts them right the moment I select the option.
Insanity is hereditary, you get it from your children
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