Tags - free Photoshop video tutorial levels command brightness luminance contrast highlights shadows midtones color colour histogram eyedropper rgb human eye vision calculation

Because the human eye doesn't see red, green and blue light equally we need a reliable way of representing the brightness of a pixel independent of colour. And so steps up the luminance histogram - the most accurate way of spotting clipped shadows and blown highlights threatening the very existence of your image!

Date Created - 6th July 2008 ***** Software Used - Adobe Photoshop CS3

Support Files - Complete Set (14.2MB) / The Colour Wheel (406KB)

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