Layers Dialog / Layer Blending Modes / Adjustment Blend Modes - Contrast

Where the upper channel is brighter than 50% (32768), contrast is increased. Where the upper channel is darker than 50%, contrast is decreased. The range is zero contrast to 200% contrast.

Where the higher layer is partially transparent, the result is mixed with the lower layer composite in a manner proportional to the amount of transparency.

Contrast blend mode
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