: Fill a grid cells based on a picture Excuse me for the title I know it's not so descriptive so I describe my point with a sample image: I want to fill that white/gary grid with a third

@Murphy569

Duplicate your layer (Cmd/Ctrl+J).
Create new layer beneath the duplicated one and fill it with white.Select both of them and merge (Cmd/Ctrl+E) (Now you should have one transparent layer and one black and white.)
Then with black and white layer selected go to Filter > Pixelate > Mosaic and create the grid you want.
When you accept changes, use levels (Cmd/Ctrl+L) and adjust light and dark sliders to suit your needs.
Then you can just cut the white from that layer using magic wand
(W).


I hope you get my idea :)

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