Photoshop by the Numbers: Histograms
Histograms pt.1 - Basics and numbers
Most retouchers know what a histogram is. I explain its mechanics in detail, and encounter a few small irritators along the way.
Histograms pt.2 - The other color modes
Convert your image to CMYK, LAB or Grayscale, and Photoshop shows histograms for it. This article outlines how they work, and questions their usefulness.
Photoshop by the Numbers
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