public ContrastAdjustmentFilter setBlueScale(float factor) {
        this.blueScale = factor;
        if (material != null) {
            material.setFloat("blueChannelScale", blueScale);
        }
        return this;
    }
Sets the output scale factor for the blue channel.

@param factor the desired scale factor (default=1)
@return this filter instance, for chaining
jme3-effects/src/main/java/com/jme3/post/filters/ContrastAdjustmentFilter.java