You might find replace useful, for instance, if you’re creating a mask in the alpha channel, but the incoming image already has an alpha channel which you want to throw away. When enabled, existing channels are cleared to black before drawing into them. intersect bbox and format - restrict the output image to an intersection of the bounding box and incoming format area. union bbox and format - restrict the output image to a combination of the incoming bounding box and format area.format - restrict the output image to the incoming format area.
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