Operation

Select the operation from the drop-down list to perform on each pixel of the input images. After the operation, the resulting grayscale value is multiplied or divided by the scale factor and then the offset is added to it. The most common scale and offset values are automatically selected as the default values when the operation is changed.
The range for the pixel values of the result image remains from 0 to 255. Result pixels below 0 will be set to 0 and result pixels above 255 will be set to 255.

[+]
Add Input Image 1 and Input Image 2 as shown below.
The default scale A is 2 and the default offset B is 0. The default result is the average of the two images.
[-]
Subtract Input Image 2 from Input Image 1 as shown below.
The default scale A is 2 and the default offset B is 128. The area where the image 1 is brighter than the image 2 has the value more than 128, and the area where the image 1 is darker than the image 2 has the value less than 128.
[*]
Multiply Input Image 1 and Input Image 2 as shown below.
The default scale A is 255 and the default offset B is 0.
[/]
Divide Input Image 1 by Input Image 2 as shown below.
The default scale A is 128 and the offset B is 0.
[Maximum]
Compute the maximum of Input Image 1 and Input Image 2 as shown below.
The default scale A is 1 and the offset B is 0.
[Minimum]
Compute the minimum of Input Image 1 and Input Image 2 as shown below.
The default scale A is 1 and the offset B is 0.