Here's a report of what I had to do to make latex2html do
what I want on Red Hat 7.2.
Please note that the moderators of this forum may suggest better
solutions -- these are simply my workarounds to get the program
working in my environment.
It was a bit of an odyssey, but I really want to use this utility, and
its output is quite good:
1) First, note that just downloading and installing latex2html
works (the program executes and produces output), but there
is a major problem, that renders the output unacceptable:
"The images generated have black borders along two
edges"
This is due to a problem with earlier versions of pnmcrop, part
of the netpbm package.
"The images did not blend with the background"
This is due to transparency issues discussed further below.
2) To deal with this, I first tried moving to netpbm-9.25.tgz,
but when I finally got it working, there were strange image
artifacts relating (my guess) to either level quantization or
antialiasing. So I rejected this path.
3) I then installed the following two rpms:
netpbm-9.14-2.i386.rpm
netpbm-progs-9.14-2.i386.rpm
4) latex2html now reported an error every time an image conversion
was attempted. I traced the problem to an apparent issue with
the arguments expected by the netpbm script pnmcrop. The
newer version (just installed above) seems to require an argument
after "-verbose". So I modified perl script pstoimg as follows:
Old: my $PNMCROP = '/usr/bin/pnmcrop -verbose';
New: my $PNMCROP = '/usr/bin/pnmcrop -verbose 0';
After this change, latex2html ran and produced output without
the black borders above.
5) But still, the images were not transparent and stood out
on the page, despite the fact that latex2html default operation
generates transparent images. The problem was traced (by
responses from this forum) to a lack of transparent PPM
support in many current browsers.
6) So I switched to gif by using the "-image_type gif" argument
to latex2html. But again, image conversion failed!
There was another problem. It appears that netpbm
program pstogif also has a argument incompatibility. The
"-trans" argument now expects no argument?, and doesn't
even work. So I made the following change to pstoimg:
Old: $pnmtoimg .= ' -trans ' . L2hos->quote($trans_color);
New: $pnmtoimg .= ' -trans ';
I played with the
new netpbm version of pnm2gif for a while, trying to make
it deal with transparency -- but I could not make it work.
But at least, with the change above, latex2html ran, and
produced output, albeit not transparent.
7) So I "punted" and wrote a small shell script to make all
gifs in the output directory transparent:
#!/bin/bash
for file in *.gif ; do {
giftrans -t '#b2b2b2' $file > xxx
mv xxx $file
} ; done
Now, after running latex2html, I enter the output directory
and run this script.
It worked! The output was transparent and free of black
borders.
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