TAILIEUCHUNG - Photoshop CS2 All-in-One Desk Reference For Dummies- P8

Photoshop CS2 All-in-One Desk Reference For Dummies- P8:Barbara Obermeier is principal of Obermeier Design, a graphic design studio in Ventura, California. She’s the author of Photoshop Album For Dummies, coauthor of Adobe Master Class: Illustrator Illuminated, Photoshop 7 For Dummies, and Illustrator 10 For Dummies. She has contributed as coauthor, technical editor, or layout designer for numerous books. Barb also teaches computer graphics at Brooks Institute; the University of California, Santa Barbara; and Ventura College | 188 Restoring Part of an image Using the History Brush tool You can also use the History Brush tool to apply an image area from a different state or snapshot to your current state. You d want to use this tool to restore a portion of an image to an earlier state while leaving the rest of the heavily modified image alone. The History Brush has an advantage over the Eraser tool in that you have access to the many different blend modes. Just follow these steps 1. In the History palette click in the far-left column of the state or snapshot you want to use as the source for the History Brush tool refer to Figure 4-2 . A brush icon appears indicating that Photoshop will use this state as the source for the History Brush tool. In my example I chose my original image just after cropping it. 2. Select the Histor y Brush tool in the Tools palette. You can also press Y or Shift Y to select the tool. 3. On the Options bar choose any other brush options you want to use such as Brush size and type Mode Opacity and Flow percentages and Airbrush. For details on the brush options see Book IV Chapter 1. 4. Select the layer in the Layers palette and select the state that you want to paint on in the History palette. 5. Begin to paint. Photoshop paints over the image in the layer with the image from the state you specified as the source in Step 1. In Figure 4-7 I painted my original faces using a 10-15 opacity set- Figure 4-7 Painting with the History brush. ting over my Water Paper filtered image. When Photoshop won t let you go back Sometimes you may see a No symbol when trying to use the Eraser with the Erase to History option the History Brush tool or the Fill with History command. You must be sure that your current image is the same file size same number of pixels as the state you are trying to go back to. Actions such as cropping trimming using the Image Size or Canvas Size commands or rotating any amount other than 180 degrees can prevent you from going back to a previous state.

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