Pictaculous is a color palette generator service from MailChimps. Users can upload PNG, GIF, or JPG image files and Pictaculous will analyze their colors to return a fitting scheme. Pictaculous's services can also be accessed from a mobile device. Their API accepts binary file data from the acceptable image format types and returns a JSON encoded hex of recommended colors as well as a URL of the received image.
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The Pictaculous Ruby SDK by Brian Getting interacts with the API to access color palette generator features. It contains installation and usage. Developers can contribute to the project by committing and pushing on GitHub.