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This demo/module shows you how to create a color picker using JavaScript and Gestures.
Any image can be used and it's pixel color data obtained by tapping or dragging around the image.
or for the most updated version:
View on GitHub
Note that this demo will not run in debugger due to requiring localhost JavaScript HTTP requests to serve the image data from cache.
There is also a specif module available for the Quasar RBG Controller. For more information see this page.