Adobe Photoshop CC for Photographers, 2014 Release, 2nd Edition

Adobe Photoshop CC for Photographers

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Conventional wisdom would suggest that a multiple undo feature is bound to tie up vast amounts of scratch disk space to store all the previous image steps. However, this is not really the case. It is true that a series of global Photoshop steps may cause the scratch disk usage to rise, but localized changes will not. This is because the history feature makes clever use of the image cache tiling structure to limit any unnecessary drain on the memory usage. Essentially, Photoshop divides an image up into ...