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I'm looking for a software package that will tell me the color of any pixel I select on my screen. That is I want to know the hex RBG code for any pixel on any web page or application that I have displayed on my PC.
You can just use GIMP directly. You can click on the foreground color, where the foreground/background colors are. When you go to the color chooser, it will have a color selector (a dropper), and you can click on that and then choose any pixel on your screen and get the color. Choosing an exact pixel could be a hassle, but it will work on anything on your screen that's visible when you click the dropper icon.