Adjust contrast. Adjusts the image contrast by increasing the brightness of pixels with more than 50% brightness, and reducing the brightness of pixels with less than 50% brightness.
Contrast adjustment in percent (-100…100 int).
Layer command. Applies to the current layer or to the composite image if layer=comp. Ignored by effect layers.
op_contrast=0, for no change in contrast. CMYK images or layers are converted to RGB before the operation is applied.
Decrease the contrast and sharpness of a higher quality image layer to visually match it to a low-quality background photo:
A future release may use the median brightness of the image rather than a fixed 50% brightness.