kernel GammaCorrection
<   nameSpace : "popforge::ImageProcessing";
    vendor : "joa ebert";
    version : 1;
    description : "simple v^gamma filter";
>
{
    parameter float3 gamma<
        minValue: float3(0.0,0.0,0.0);
        maxValue: float3(4.0,4.0,4.0);
        defaultValue: float3(1.5,1.5,1.5);
        description: "exponent";
    >;
    
    void evaluatePixel(in image3 source, out pixel3 result)
    {
        result = pow(sampleNearest(source,outCoord()), gamma);
    }
}