How to work with Arithmetic
To work with Arithmetic
To use the Image Arithmetic dialog box:
a) Function New Color Value Equals
Add Image 1 Value + Image 2 Value
Subtract Image 1 Value - Image 2 Values
Multiply Image 1 Value x Image 2 Value
Difference Absolute Value of (Image 1 Value - Image 2 Value)
Lightest Maximum of (Image 1 Value, Image 2 Value)
Darkest Minimum of (Image 1 Value, Image 2 Value)
Average (Image 1 value + Image 2 Value)
b) From the Channel panel, select the color channels to combine:
Select the "All channels" check box to use all the color channels in both images. This will produce a 24-bit image.
Select a specific channel for each image to produce a grayscale image.
c) Set the Divisor and Bias modifiers. The modifiers are applied to the color values produced by the Formula and the Channel selections.
The Divisor number is used to divide the color values. It can reduce the effects of the other selections.
The Bias number shifts each color value by a fixed amount. The number is added to the color value produced by the Formula, Channel, and Divisor selections.