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IMAGE CALCULATIONS

Under the Image menu you'll find two useful commands—Apply Image and Calculations. Before the introduction of layers in Photoshop 3.0, image compositing and controlling effects relied heavily on channel masking. The most advanced method to create fine-edged masks was to use the Image Calculation commands to combine and refine images and channels. Today—with the use of layers and blending modes—many of their results can be achieved more easily. However, these commands still offer useful methods for creating image composites and for building masks that maintain fine tonal and edge detail. Because Image Calculations use interchannel math that compares channel values to create the results, they are often called chops (channel operations).

Note

A discussion of Calculations would not be complete without a sincere tip of the hat to John Knoll, Kai Krause, David Biedny, Bert Monroy, and Bryan Guignard. It is with great appreciation that I learned from all of their lectures, books, articles, and online tutorials.



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