Excuse me for the title I know it's not so descriptive so I describe my point with a sample image:

enter image description here

I want to fill that white/gary grid with a third color(red e.g) based on the transparent brain like image. like this:

enter image description here

How to do this?

  • How did you make the example?
    – KMSTR
    Commented Apr 9, 2015 at 7:02
  • Using Paint Bucket Tool
    – SAMPro
    Commented Apr 9, 2015 at 7:17
  • 1
    it seems like you want to produce pixle art en.wikipedia.org/wiki/Pixel_art
    – hsawires
    Commented Apr 9, 2015 at 8:31
  • You might want to create this in Illustrator: create a rectangle, split into grid and then make it a live paint group so you can colour away.
    – Vincent
    Commented Apr 9, 2015 at 9:53
  • 1
    If you have access to Illustrator, try this solution.
    – Vincent
    Commented Apr 13, 2015 at 8:37

1 Answer 1

  1. Duplicate your layer (Cmd/Ctrl+J).
  2. 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.)
  3. Then with black and white layer selected go to Filter > Pixelate > Mosaic and create the grid you want.
  4. When you accept changes, use levels (Cmd/Ctrl+L) and adjust light and dark sliders to suit your needs.
  5. Then you can just cut the white from that layer using magic wand (W).

I hope you get my idea :)

  • Hi Revnart, welcome to GDSE and thanks for your answer. If you have any questions, please see the help center or ping one of us in Graphic Design Chat once your reputation is sufficient (20). Keep contributing and enjoy the site!
    – Vincent
    Commented Apr 9, 2015 at 13:00
  • Thanks. It's an interesting method, BUT it's not my answer. I want to fill that grid, and as you see grid cells is rectangular not square.
    – SAMPro
    Commented Apr 11, 2015 at 6:06

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