ftp.nice.ch/pub/next/graphics/bitmap/dips.1.00.s.tar.gz#/DIPS/_dips/masks

homo.mask
 

hsobel.mask
 

ihomo.mask
 

laplace.mask
 

vsobel.mask
 

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.