From pamtotga man page:

pamtotga was called ppmtotga until Netpbm 10.6 (July 2002). That was always a misnomer, though, because a PPM class program would not be able to tell the difference between PGM and PPM input (it would all look like PPM), and thus could not choose the output Targa image type based on the type of the input. Netpbm 10.6 also added the ability to handle a transparency channel, so it became a PAM class program.

I see now that ppmtotga is just a symlink to pamtotga.

However, netpbm-progs provides almost 30 binaries that are just symlinks to other binaries and all of them come with (very short) man page. For consistency, I think that ppmtotga should have man page as well.

Especially as upstream does provide (HTML) man page for it: http://netpbm.sourceforge.net/doc/ppmtotga.html .

Would it be possible to add upstream HTML page to RHEL 7.5 package and build man page based on it?

Agree, comment #2 was just FYI.

I have just find the reason of missing this man page.
From previous maintainer in netpbm spec file:

# Don't ship man pages for non-existent binaries and bogus ones
for i in hpcdtoppm \
         ppmsvgalib vidtoppm picttoppm \
         directory error extendedopacity \
         pam pbm pgm pnm ppm index libnetpbm_dir \
         liberror ppmtotga; do
         rm -f $RPM_BUILD_ROOT%{_mandir}/man1/${i}.1
done


So it's easy fix and I am able to push it for RHEL-7.5.
Question is, if there are any others binaries, which don't have man page, as ppmtotga and should have them.

> Question is, if there are any others binaries, which don't have man page, as ppmtotga and should have them.

I don't think so. Our automated test checks for man pages of all binaries provided in netpbm-progs package and ppmtotga is the only one that currently shows up as missing.

Shipping ppmtotga man page will be enough.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0712