UPDATE: Renamed to Image DNA and released as a Chrome Extension, read more.
I spent last weekend working on a color palette extractor in HTML5. These examples illustrate automatically picked 7-color and the 90-color palette to represent the image. Although the results are organized by the color popularity within the palette, colors that don’t show up much are given the same diversity in the 90-color palette. For instance, in the following image, the diversity of red in the 90-color palette is given equal weight to green;
Speed is looking good, these images are taking around 200ms to process.
More to come on this, and future developments in the land of color 
Oct 20, 2011 @ 14:16:08
Woow. this is cool! would you share the source code?
Oct 21, 2011 @ 10:26:06
Sorry, unfortunately, I cannot release the source code, but am happy to say the project is now ready for the wild—all polished, and super sleek. We’re waiting to implement some more substantial updates on ColRD before launching, it’s currently in a private beta.
Nov 01, 2011 @ 08:10:09
great code, impatiently wait to share source ode