Thanks jonathan,

I have manged to process each row as shown in these examples.  The bit I am 
stuck on is applying the sample function on pixels I have already modifyed 
during the same pass.  This is because the sample function only works on the 
input image ie input0.sample(...)

Is there a way of using the sample function on the out Row?

ie
Pixel pixel(channels);
out.sample(centre, uVector,vVector,pixel)
foreach ( z, channels )
        ((float*)(out[z]))[x] = pixel[z];



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