Canvas Color Picker

Currently, color pickers on the web use CSS gradients instead of canvas. The trouble with this approach is that the picker has to be a fixed size. Any change in the size of the color picker means a change in your calculations.

Furthermore, the colors you get from such pickers are approximates. They're based on a calculation involving your mouse coordinates, the size of the picker and HSL.

By using HTML5 Canvas, we can get extract absolute color values, so they're always spot on. Canvas was built for this sort of application, and is the ideal tool for the job.

When I was building Stylo I needed a top notch color picker, such as Photoshop's, but couldn't find one. I ended up writing my own, called ColorCanvas, which I'm happy to announce I'm open sourcing today.

You can find a demo here, and the source on GitHub.

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This nice little app is great for shuttling feedback to and fro on web page comps. Just upload the page design, then highlight and comment on little areas, to get your ideas across.

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