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oneband - get a single band of an image
oneband inimage.rgb outimage.bw
band
oneband extracts a single band of a color image. Normally
band should be a number in the range [0...3]. Band 0 is the red part of and
RGB image, while band 1 and 2 are the green and blue bands. Band 3 potentially
represents alpha.
cglue(6D)
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