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iflip - flip an image
iflip inimage outimage [x y xy yx 90 180
or 270]
iflip flips an image in the following ways: either in
the x or y direction, with xy the upper-left and lower-right corners are
flipped, with yx the lower-left and upper-right corners are flipped, or rotates
an image 90, 180, or 270 degrees in a clockwise direction.
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