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Value Nodes >
Value Divide node
The Value Divide node divides to the values of imagea the values of imageb at each pixel.
input
image_a
image_b
output
image
On the left toolbar choose Value Nodes > Value Subtract.
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Drag the Value Divide icon into the Node Graph.

Adjust the attributes of the Value Subtract node.
image_a
A VALUE color mode image.
image_b
A VALUE color mode image.
image An image of VALUE color mode.

Value
A constant value that is divided at every pixel.
Mask Min
If checked, the pixels with a value equal to the low value of the image are not divided.