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About Undoing, Layering and Saving Changes
How to "go back" if you're dissatisfied with your edits, create adjustments layers, and save your results.
Undoing Changes You've Made via the History Palette
Photoshop allows only one “level” of undo; i.e.: you can only undo the last step. However the History palette tracks changes made to the image back to the last save.
You will find the History palette
under Window > History.
Navigate backward through your changes by clicking on them in the History palette.
Adjustment Layers
You can also perform adjustments as Adjustment Layers “on top of” your image which you can then turn off and on individually.
Choose Window > Layers to view the layers palette.
Hold down the Contrast icon at the bottom of the palette to view a menu of your options for adjustment layers.
When you select an adjustment here, the corresponding dialogue box will appear, exactly as before. However, once you have made your adjustment and clicked "OK," the adjustment settings will be stored in a layer "on top of" your image.
You can hide the adjustment layer by clicking the corresponding eye icon on the left side of the palette.
You can also revisit and alter the adjustment by double-clicking / right clicking on the corresponding contrast icon.
NOTE: to preserve the adjustment layers for future editing, you should save the image file in .psd (Photoshop) format. JPG format will incorporate the adjustments but collapse the layers.
Saving Changes Made to Your Media Grant Image Files
The CD ROM you received from the Teaching Enhancement center is a non-rewritable disc, in other words, you cannot save any further information on that disc. You will have to save your edited image file(s) to another location such as your hard drive or some form of removable, rewritable media. The advantage of this is that you will always have an unedited "original" scan to which you can return if necessary.
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