Colors makes picking a color from your screen an easy point and click process.
With Colors running it is constantly tracking your mouse pointer and registers the pixel color that your mouse is currently over. If you like a color, just click and Colors will freeze the color and pop up a context menu where you can choose if you want to copy the web color, UIColor or NSColor and also gives you the option to turn the Click To Copy context menu off.
This is the app to get if you are a developer or web designer as well as a graphics artist because it really does make life simpler.
