I was looking for a program that would let me pick colors from within DirectX windows. While most of the apps I tried weren't up to the task, Color Picker Pro was able to pick colors from such interactive windows. Recommended!
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Color Picker PRO
I have used this utility off and on for developer for over ten years, it has been aquired by a different entity and took a bit to find it, as there are a lot of color pickers out there. This is the easiest one I have found for application development. It used to be freeware now you have to purchase a license, but priced accordingly.