Adobe Photoshop CS4 User Manual
Page 289
282
USING PHOTOSHOP CS4
Selecting and masking
Last updated 1/10/2010
Subtract
Subtracts the pixel values in the source channel from the corresponding pixels in the target channel. As with Add
mode, the result is then divided by the Scale factor and added to the Offset value.
The Scale factor may be any number between 1.000 and 2.000. The Offset value lets you lighten or darken the pixels in
the destination channel by any brightness value between +255 and –255.
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