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Chapter 6. Working with the History Pale... > Working with Linear and Non-Linear H...

Working with Linear and Non-Linear History

The History palette records each step performed on a Photoshop document in a linear fashion from top to bottom. However, the purpose of the History palette is not to simply record your progress through a document, it's there to help you make changes and go back in time to correct mistakes. Photoshop handles the History palette in two ways-linear and non-linear. When you work in a linear History palette, clicking on a previous step causes all steps underneath to gray out. If you then add a step, the grayed out steps are removed and the new step is added to the bottom of the list. A linear palette is organized and is very RAM efficient, however, once a History Step is removed, it cannot be retrieved. When you work in a non-linear History palette, clicking on a previous step does not cause the steps underneath to gray out. If you then add a step, the new step is added to the bottom of the History palette. The new step represents the characteristics of the step you selected, plus any added actions. A non-linear palette is not organized and consumes more RAM memory. It's advantage lies in the fact that History steps are not deleted; they are simply reorganized.


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