The information how to enlarge the files is too hard to find. Actually with 3.4.3-6 I could not locate a demonstration line somewhere at all.
So I suggest to put a small secion in the README.Debian:
If you want to enlarge your tileset, try something like
cd /usr/share/pixmaps/nethack
mv x11tiles x11tiles.org
xpmtoppm <x11tiles.org | pnmscale 1.25 | ppmquant 90 | ppmtoxpm
>x11tiles
# the tools are in the netpbm package
Note: Not all commands work to enlarge the xpm, I just tried convert
from imagemagick which resulted in a file that xnethack did not like.
pgpda9SgYSw2A.pgp
Description: PGP signature
