Gradient Map
The Image > Adjustments > Gradient Map (Figure 10.93) does a rather simple and unusual thing: It first converts an image to grayscale, and then replaces the shades of gray in the image with different colors that show up in a gradient. When you first get into the dialog box, it will default to a black and white gradient, which should just make your image look grayscale. Then, if you click on the down-pointing arrow to the right of the gradient preview, you'll be able to choose a preset gradient to replace the shades of gray that were in the original image (Figures 10.94 and 10.95). If you'd prefer to bypass the preset gradients and create your own gradient, you can click in the middle of the gradient preview to access the gradient ...
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