public ContrastAdjustmentFilter setExponents(float redExponent, float greenExponent, float blueExponent) {
        setRedExponent(redExponent);
        setGreenExponent(greenExponent);
        setBlueExponent(blueExponent);

        return this;
    }
Sets the power-law exponent for each color channel.
The default value for each exponent is 1, which produces a linear filter.

@param redExponent the desired red-channel exponent
@param greenExponent the desired green-channel exponent
@param blueExponent the desired blue-channel exponent
@return this filter instance, for chaining
jme3-effects/src/main/java/com/jme3/post/filters/ContrastAdjustmentFilter.java