877 Posterizing colors nondestructively

- Hey gang, this is Deke McClelland. … Welcome to Deke's techniques. … Last week I showed you how to create a piece … of posterized false color artwork … using Photoshop's Paint Bucket Tool, … which is a very old tool … that actually predates Photoshop by six years … when Bill Atkinson created it … for the very first version of MacPaint. … Compare that to using a Gradient Map adjustment layer, … which came along much later and, no offense, Bill, … the man is a legend people, is a lot more flexible. … And even though the feature is called Gradient Map, … it's just the thing for creating abrupt color transitions … without even trying. … Here, let me show Bill exactly how it works. … All right, so here's the entirely non-destructive version … of the artwork achieved … using a Gradient Map adjustment layer. … And so what we're going to do is start … with the destructive version, the so-called destructive, … because we used the Paint Bucket Tool … in order to permanently modify pixels. … Pixels that we could again modify later …