It seems that if you try to set a QCRenderer's image input using a
CIImage that has been processed with a CIAffineClamp, QCRenderer
will not handle the CIImage correctly, rendering it black. Is there
some technical reason why this happens, or am I just doing
something incorrect in my code?
Affine Clamp generates an infinite image, you need to Crop it before
passing it to QC