im_image_sanity - check image descriptors for sanity
#include <vips/vips.h>
int im_image_sanity( IMAGE *im )
im_image_sanity(3) performs a few simple checks on the IMAGE for bad
fields. If it finds a problem it prints a warning message and returns
-1.
It is called from various places within VIPS to try to catch errors
early.
All functions returns 0 on success and -1 on error.
im_incheck(3).
Feb 2001