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The Clamp node, like the ColorLookup node, is not explicitly designed to provide feedback on images, however it can easily be used to do so. It functions in much the same way as the ClipTest node: it flattens out the user-defined lower and upper lightness range of the image and, if you tick MinClampTo and MaxClampTo, can replace these values with user defined colors. Properly used it can provide clearer information than the ClipTest node.