Photoshops History Panel

Working with the History panel is a bit like Try-before-you-buy. You try something out, and if you don't like the result, you simply give it back. Photoshop has very sophisticated mechanisms for undoing things you have just done.

Photoshop notes the last n steps you have made, according to settings you make in the general Preferences. We usually select a value of 25. You can then undo (and, if you don't change any settings, redo) each of the last n steps sequentially. You can use the History panel not only to reset your work to an earlier state, but also to compare earlier versions of your image with the current state.

In order to return to a particular state, simply click on the appropriate state in the History panel or move the History state slider Q> to the appropriate point using your mouse.

In order to undo the last step, use |ctrl|/^]-|"z~]. You can then undo additional steps using (Mac: @-g-[z~), right back to the beginning of the current history log.

You can select more than 25 History states, but they use additional memory and temporary disk space which can make Photoshop noticeably slower.

The History panel icons (al ^ % function as follows:

_I Save a new document for the current state

_1 Take new snapshot (see the next section)

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Figure 4-79: The History panel

Figure 4-79: The History panel

> You can set the detail level and save location for the History log in the general section and the number of states to note in the Performance section of the Photoshop Preferences dialog. There are more options available in the drop-down menu T= at the top of the History panel.

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