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+Why does blind-from-video produce darker images than blind-from-image and
+why does blind-to-video produce brighter images than blind-to-image?
+
 blind-transform		affine transformation by matrix multiplication, -[xy] for tiling, -s for
 				improve quality on downscaling (pixels' neighbours must not change)
 blind-apply-map		remap pixels (distortion) using the X and Y values, -[xy] for tiling, -s for