I would like to paint pictures of characters on PC (Windows 7).
I need a software which lets me change the color of (for example) hair with just one click.
In other words, I would like to change all color in cartoon picture to white.
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Try this free utility http://www.gimp.org/ to change all color in cartoon picture to white.
GIMP is the GNU Image Manipulation Program. It is freely piece if distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many Operating System, in many languages.