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I have a text with #000000 colors, and I'd like to move a rectangular glass over it and see the color.

It'd be helpful if I could rest the glass, choose another color in the app and have the text be modified accordingly.

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Knowing your operating system would help! – slhck Aug 7 '11 at 12:06
gnulix or windo. – user93200 Aug 7 '11 at 12:07

Colorbox is a simple and powerfull software which make you able to do exactly what you want with colors

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+1 for apparently understanding exactly what was wanted from that explaination. – krowe Oct 4 '14 at 3:32

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