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There are a lot of nice JavaScript color pickers out there (colorjack, colourmod, yahoo), but none of them has a full HSB and RGB options of Photoshop's picker. Some pickers try to generate the entire color map in JavaScript by drawing a 256x256 grid made of div. This is very slow, which is why color pickers that go the JavaScript route often don't draw the entire map, but instead only 4x4 or 8x8 blocks