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subimg - extract a sub-region from an image
subimg inimage outimage
x1 x2 y1 y2
subimg extracts a region from an image. The region
to be extracted is specified by x1 x2, y1 and y2. These coordinates are
relative to the bottom left corner of the image. Negative values may be
used to give coordinates from the upper right corner. To extract an image
inset 10 pixels from a source image use coordinates 10 -10 10 -10.
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