Using the various blending modes Photoshop offers, you can add a
level of richness and authenticity to your texture. The appearance
of rust, mold, cracks, a wood grain, and virtually anything you can
think of can be made to look like it is part of the overall
texture. Overlays are powerful and they should be used carefully or
they can override the base texture. Here is a guide to best use
them in your work.
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