To add or remove a color from a selection, use the Select Color Range command. You can choose to add or remove a color from the selection border. The color that you choose is either added or removed, and the selection border changes. If you copy and paste the selection, the pasted area has the color added or removed.
To add or remove a color from a selection area:
Make a selection in the image.
Choose Selections > Modify > Select Color Range.
Select either the Add color range or Subtract color range option.
Move the cursor over the image and click a color. The Reference color box, displays the selected color. You can also click this box to open the Color dialog and choose a color. For more information, see Choosing Colors.
In the Tolerance edit box, specify a color tolerance (0 to 200). If the value is 0, no colors are added or removed from the selection area. If you specify a higher value, shades of the color or related colors are added or removed.
In the Softness edit box, specify the amount of softness for the referenced color.
Click OK. The selection borders change to add or exclude the color you specified.
Note: To remove a color from a selection, you can also use the Paste As Transparent Selection command to remove a color when you paste a selection. However, with this command you cannot remove shades of a color, only the exact color you specify as the background color. For more information, see Cutting, Copying, and Pasting.
Changing the Feathering of a Selection
Cleaning up the Edges of a Selection
Modifying the Select Selection Borders
Removing Specks and Holes from a Selection
Smoothing the Boundary of a Selection