OptionalalphaLayer opacity 0..1 (alpha-over the layers below). Default 1.
OptionalbrightnessLinear brightness multiplier. Default 1.
OptionalcontrastContrast about mid-gray (1 = unchanged, >1 punchier). Default 1.
OptionalgammaGamma exponent (1 = unchanged). Default 1.
OptionalsaturationSaturation (0 = grayscale, 1 = unchanged, >1 boosted). Default 1.
OptionalhueHue rotation in degrees. Default 0.
Per-layer color / opacity adjustments, applied at composite time. Every field defaults to a no-op (
alpha/brightness/contrast/gamma/saturation= 1,hue= 0).