im_subsample - subsample image by integer factor
int im_subsample(in, out, xsub, ysub)
IMAGE *in, *out;
int xsub, ysub;
im_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.
The function returns 0 on success and -1 on error.
im_shrink(3), im_similarity(3), im_zoom(3)
1989-1996 The National Gallery and Birkbeck College
19 Aug 1996