I have a damaged photo. It has mold, and the red channel is damaged. The faces in that channel cannot be seen clearly.
I have Photoshop CS6. Is there any idea to fix that?
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Not completely impossible, but would take a lot of meticulous, skilled brushwork with the tools such as, but not limited to, clone-stamp (s) key, healing and / or spot healing brushes (j) key to fix up some of those problems, as well as a good eye for detail. I would be inclined to work on the full-colour image, it appears to be more 'salvageable' than the red-channel version you showed.
You may be better off to get a specialist retoucher to do it for you if there is a photolab / photographic service near you, unless you're fairly skilled and adept with the CS6 brush tools and their settings.