If you have liked a color and would like to know its HTML, HEX, RGB, CMYK and HSV values, then portable freeware Pixie may be able to help you.
Pixie color picker for PC
Pixie app would be especially useful if you are a web designer or a graphic artist and are usually hunting for nice colors on your screen that you would like to use.
Simply run Pixie, point to the color and it will tell you the HTML, HEX, RGB, CMYK and HSV values of color.
You can then use these values to reproduce the color in your favorite programs.
Pixie also shows the current X/Y position of your mouse.
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You may also want to check out some free color picker software here.