The Snapshot command is a little safety net that lets you make a temporary copy(or snapshot) of the composite image of your canvas. The new snapshot is listed at the top of the History palette, allowing you to use it with the History brush. More importantly, you can experiment with filters and other image processes, but revert to a snapshot, recovering your original state. Alternately, you can run several different tests, compare, and choose the snapshot you prefer.
Creating a Snapshot
Before you can fully realize the usefulness of snapshots, you must be able to create them. Luckily, creating a snapshot is, well, a snap!
Creating a snapshot.
Snapshot dialog box.
Using Snapshots with the History Brush
The History brush lets you paint a copy of one state or snapshot of an image into the current image window. This tool makes a copy, or sample, of the image and then paints with it. The limitation is that it can only paint from a snapshot to the same location on the canvas, which is actually a boon when you are trying to line things up perfectly or paint in an exact but limited area. To try using the History brush, open any file and follow these steps:
For this example, I chose to apply the Hue/Saturation filter
Setting up the History brush.
Fantastic, isn’t it?
I have brushed into the eye area to bring in the glowing red I had created with the Hue/Saturation filter. This is a little more controllable than selecting the eyes and applying the filter to just that section, and it is easier to organize than a plethora of duplicated layers. The down side is that snapshots are lost upon closing the document. If working on an image that you know will take days to accomplish, you organize your file differently most likely using layer comps.
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Adobe Photoshop Tutorial
Preferences And Settings
Customizing Your Workspace
Starting With Color Maps
Tiling And Transformations
Matte Paintings From Pictures
Quick Fixes For Common Problems
Masks And Mattes
Noise And Grain
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