Modifying selections
You can use the Expand, Contract, Smooth, and Border commands to
modify selections in images.
These commands make it easy to fine-tune a selection by expanding
or contracting the selection border by a specified number of pixels, or
by adding or subtracting pixels based on color.
Expanding a selection
You can expand a selection by adding a specified number of pixels to
the selection border.
To modify an active selection, choose Image > Select > Modify >
Expand. Type a value in the Radius text box and click OK. Canvas
adds the specified area to the selection.
Contracting a selection
You can shrink a selection by subtracting a specified number of pix-
els from the selection border.
To modify an active selection, choose Image > Select > Modify >
Contract. Type a value in the text box and then click OK. Canvas
subtracts the specified area from the selection and the dashed border
contracts.
Smoothing a selection
The Smooth command is useful after you have made a color-based
selection that has left stray pixels inside or outside of the selected
area. The Smooth command includes or eliminates the stray pixels to
even out the selection. The value you type in the text box determines
which pixels will be included or excluded in the selection at the bor-
der.
To modify an active selection, choose Image > Select > Modify >
Smooth. Type a value in the text box and then click OK. Canvas adds
or subtracts pixels to the perimeter of the selection based on the
radius number of pixels you specified.
Bordering a selection
After you define a selection, you can select the area at the border of
the selection by specifying an offset in pixels from the selection edge.
To modify an active selection, choose Image > Select > Modify >
Border. Type a value in the text box and click OK. Two dashed bor-
ders indicate the selected border.