> I have tried netpbm 10.18.4 (with libpng 1.2.7). It works. The > problematic one is netpbm 10.27 (with libpng 1.2.8). All from > GnuWin32.
Ah! So at least this problem is not related to groff. Please report this problem to the netpbm people (or maybe a newer version has already been released which doesn't contain this error). Keith, I would be glad if you could incorporate this information into the README.MinGW file. Werner