1 A blending mode controls how pixels in an image are affected by the tools or other layers. It's helpful to think in terms of the following colors when visualizing a blending mode's effect:
• The base color is the original color in the image.
• The blend color is the color being applied with the painting or editing tool.
• The result color is the color resulting from the blend.
2 The History palette, eraser tool, and history brush tools can all restore your image to an earlier state so that you can undo an operation or correct a mistake.
3 The art history brush tool paints with a stylized stroke based on a selected state or snapshot. The stylized stroke of the art history brush tool simulates the look of different paint styles. The history brush tool paints a copy of the selected state or snapshot into the current image window. You can use the history brush tool to remove the strokes made with the art history brush tool.
4 One method of preserving areas of transparency on a layer that you are painting is to use the Lock Transparent Pixels option—one of four Lock options on the Layers palette. A second method is to create a new layer above the layer with the transparent pixels you want to protect and then to group the new layer with the layer below it. With the layers grouped, you can paint freely on the new layer because the paint applies only to areas with colored pixels in the underlying layer.
5 Two ways of adding to the default set of available brushes are to load additional brush libraries and to create new custom brush shapes. Adobe Photoshop 7.0 includes a number of brush libraries that are available but not loaded by default, keeping the number of brushes on the Brushes palette down to a manageable number. You can switch from one library of brushes to another, or you can open more libraries and append them to the current set. You can define custom libraries that include the brushes you use most often, just as you can define custom brush shapes to suit your work needs. For more information, see "Managing libraries with the Preset Manager" in Photoshop 7.0 online Help.
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