Add And Subtract Blending Modes - Adobe Photoshop CS6 User Manual

6. Choose the second source image, layer, and channel, and specify options.
7. For Blending, choose a blending mode.
For information on the Add and Subtract options, see Add and Subtract blending modes. For information on other blending options, see
Blending mode descriptions.
8. Enter an Opacity value to specify the effect's strength.
9. If you want to apply the blending through a mask, select Mask. Then choose the image and layer containing the mask. For Channel, you can
choose any color or alpha channel to use as the mask. You can also use a mask based on the active selection or the boundaries of the
chosen layer (Transparency). Select Invert to reverse the masked and unmasked areas of the channel.
10. For Result, specify whether to place the blending results in a new document or in a new channel or selection in the active image.

Add and Subtract blending modes

The Add and Subtract blending modes are available only for the Apply Image and Calculations commands.
Add
Adds the pixel values in two channels. This is a good way to combine non-overlapping images in two channels.
Because higher pixel values represent lighter colors, adding channels with overlapping pixels lightens the image. Black areas in both channels
remain black (0 + 0 = 0). White in either channel results in white (255 + any value = 255 or greater).
Add mode divides the sum of the pixel values by the Scale amount, and then adds the Offset value to the sum. For example, to find the average of
the pixels in two channels, add them, divide by 2, and enter no Offset value.
The Scale factor may be any number between 1.000 and 2.000. Entering a higher Scale value darkens the image.
The Offset value lets you lighten or darken the pixels in the destination channel by any brightness value between +255 and –255. Negative values
darken the image; positive values lighten the image.
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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