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Google+ Flood-It board converter
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Google+ Flood-It Board Converter

Copyright © 2011 Bart Massey

This is a little pile of code for converting a screenshot image of a Google+ Flood-It board to a textual array of pixel colors suitable for building search programs around. You can currently find Google+ Flood-It at

To invoke the code, just say

sh size board-image

The current size values for small, medium and large Google+ Flood-It boards are 14, 21 and 28 squares: the code has no heuristic for figuring this out, so tell it the right thing. The board-image file can be any PNG (preferred) or JPG (or any of a number of other formats, really) image of a Flood-It board.

The code has many Google Flood-It specific assumptions. In particular, the code has a bunch of fairly narrow heuristics to detect exactly six square colors, which are assumed to be (r)ed, (g)reen, (b)lue, (c)yan, (m)agenta and (y)ellow.

The code makes heavy use of a modern version of NETPBM, so you need to have that installed. If the code complains, the most likely problem is that you have some ancient version of NETPBM like the one in Debian; get the SourceForge one that actually works.

This work is released under the MIT License. Please see the file COPYING in this distribution for license terms.


  • Driver script.
  • floodit-text.awk: Used by driver script as last stage.
  • floodit-pixels.awk: Used in development of color heuristic.
  • board.png: Sample board screenshot.
  • floodit-board.txt: Output of on sample screenshot.
  • COPYING: License information.
  • README.markdown: This README.
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