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175
Adobe Photoshop Help
Selecting
Using Help
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Contents
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175
5
Define the edge of the object you want to extract:
•
To draw a highlight that marks the edge, select the edge highlighter tool
in the
dialog box, and drag so that the highlight slightly overlaps both the foreground object
and its background. Use Smart Highlighting to trace sharper edges. Use a large brush to
cover wispy, intricate edges where the foreground blends into the background, such as
hair or trees.
If you use Smart Highlighting to mark an object edge that is near another edge,
decrease the brush size if conflicting edges pull the highlight off the object edge.
If the object edge has a uniform color on one side and high-contrast edges on the other
side, keep the object edge within the brush area but center the brush on the uniform
color.
•
If the object has a well-defined interior, make sure that the highlight forms a complete
enclosure. You do not need to highlight areas where the object touches the image
boundaries. If the object lacks a clear interior, highlight the entire object.
•
To base the highlight on a selection saved in an alpha channel, choose the alpha
channel from the Channel menu. The alpha channel should be based on a selection of
the edge boundary. If you modify a highlight based on a channel, the channel name in
the menu changes to Custom.
•
To erase the highlight, select the eraser tool
in the dialog box, and drag over the
highlight. To erase the entire highlight, press Alt+Backspace (Windows) or
Delete (Mac OS).
6
Define the foreground area:
•
If the object has a well-defined interior, select the fill tool
in the dialog box.
Click inside the object to fill its interior. (Clicking a filled area with the fill tool removes
the fill.)
•
If the object is especially intricate or lacks a clear interior, make sure that the highlight
covers the entire object, and then select Force Foreground. Select the eyedropper tool
in the dialog box, and click inside the object to sample the foreground color, or click
in the Color text box and use a color picker to select the foreground color. This
technique works best with objects that contain tones of a single color.
7
Click Preview to preview the extracted object, or skip to step 10 to extract the object
without a preview.
Selected area highlighted and filled, and extracted object