STOIK Color By Number allows you to convert photo to a paint-by-number pattern optimized for the palette you have chosen. It also allows to print the pattern together with color key. The software is very easy to use and is packed with a nice GUI. Just scan the photo or load graphics file from disk, choose the brand of paints/crayons to be used and the program will convert photo with desired result.
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STOIK Color By Number costs 19 USD.