im_replicate - replicate an image horizontally and vertically
im_replicate( IMAGE *in, IMAGE *out,
int across, int down )
im_replicate(3) repeats image in across and down a fixed number of
times to make a new larger image.
The current implementation is optimised for the case where image in is
small and across and down are large.
The function returns 0 on success and -1 on error.
National Gallery 2003
6 October 2003