Behind Mode
Most of the blending modes available in Photoshop show up in the pop-up menu at the top of the Layers palette, but the Behind blending mode shows up in only a few areas of Photoshop (painting tools and the Edit > Fill dialog box). Behind mode limits the changes you make to a layer so that they only affect the transparent areas of the active layer. Using Behind mode is similar to working on a layer directly below the one that is active. Painting on a layer in Behind mode gives the impression that you're painting underneath the active layer (Figures 13.5 to 13.7).
Figure 13.5. A layer that contains transparent areas. (©2005 Photospin, www.photospin.com)
Figure 13.6. Painting in Behind mode.
Figure 13.7. The brush strokes appear ...
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