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Part 8. Drawing, Painting, and Filling w... > Task 4 How to Use the History Brush

Task 4 How to Use the History Brush

The History Brush allows you to selectively paint an iteration of an image from a previous state, as displayed in the History palette. Recall that as you work on an image, previous image states are recorded in the History palette. The History Brush lets you access these previous states as a source file, brushing them back into an image. The History palette stores only a limited number of states as specified with the General Preferences box (select Edit, Preferences, General). As you add states to the palette, you can convert a state to a snapshot to preserve that state. The basic rules of working with the History palette are outlined in Part 2, Task 5, “How to Undo with the History Palette.”

Select the History Brush Tool

With the image file you want to modify open onscreen, select the History Brush tool from the toolbox. Note that all history states are erased when a file is closed; for this task, make sure that you are working with a file that has been modified from its original state since it was opened.

Set the Opacity

In the Options bar, set the Opacity slider to determine the transparency or opacity of the brushstroke. For example, set the Opacity slider to 100 to add the history state as a solid area. Lower the value on the Opacity slider to increase the transparency of the brushstroke.

Select a Brush

Select a brush size and a feathered effect from the Brush menu in the Options bar.

Set the Source

Choose Window, History to open the History palette. Compare the various available history states and snapshots, and click the left column to place the source icon (a paintbrush) next to the state or snapshot you want to use as a source.

Paint the Image

Move the cursor into the image window and click and drag to paint in the source image as it exists in the state you selected from the History palette in Step 4.

Look at the Results

In this example, the image was modified with a filter; the original image was used as the source to paint back the figure of the statue. The before and after images are shown here side by side so that you can see the differences.



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