int im_subsample(in, out, xsub, ysub)
IMAGE *in, *out;
int xsub, ysub;
DESCRIPTIONim_subsample() sub-samples image in by an x and y integer factor. It is much faster than im_shrink(), especially for large partial images.
It works for any image type.
RETURN VALUEThe function returns 0 on success and -1 on error.
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