How to scale image?

Question

I input a image (size: 200x200 px), and I want to scale it in pixel bender. I want to output smaller image (size: 20x20 px) .
HOW ?
THANKS:)

Answer 1

You could do something like this:
<languageVersion : 1.0;>
kernel constrained_scale
<  
    namespace: "com.moc";
       vendor: "foo";
      version: 1;
>
    parameter float scale
    <
        defaultValue:  1.000;
            minValue:  0.001;
            maxValue: 10.000;
>;
    input  image4 src;
    output pixel4 dst;
    void
    evaluatePixel()
        float2 scaledCoordinate = outCoord() * float2x2(1.0/scale, 0, 0, 1.0/scale);
        dst = sampleNearest(src, scaledCoordinate);