Here’s a handy tip for flattening out bitmaps with some light variation across the surface as found on this website:

  1. Open image in Photoshop
  2. Duplicate Background layer [ Ctrl-J ]
  3. Open Filter > Blur > Average…
  4. Double click Background layer to change it into movable layer.
  5. Move it to the top of the stack, change it’s opacity to 50% [ 5 ] and blending mode to Linear Light
  6. Open Filter > Other > High Pass… and play with Radius parameter to control the effect

Obviously it’s not going to work on all bitmaps, but the few I’ve tried it on have worked out a treat.​

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