Illustrators often shy away from some of the more technical seeming aspects of Photoshop, but it's good to be familiar with the Histogram. This video will introduce the basics of how to use it, as well as a specific case where it comes in handy overlaying texture onto a painting. Note: In the video I fail to mention that the histogram is set to the "Luminosity" channel, not the default RGB channel. This ensures that you're measuring the value distribution, not the amount of R G and B.

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AuthorMatt Kohr