[Groff] Better Images for HTML.

[Ralph Corderoy]

Hi,

I was a bit disappointed in the quality of the images I was producing
for troff.org;  the anti-aliasing I was doing using netpbm wasn't very
good.

I tried -Thtml but that seemed to be using a similar pipeline to me,
without the anti-aliasing step.

After a bit of digging into GhostScript I found it had options I hadn't
heard of before to do just what I wanted.  Here's my grofftogif script
I'm using now.

    #! /bin/sh

    # this should produce png files but pnmtopng is broken on this system.

    groff "$@" |
    gs -q -r144 \
        -sDEVICE=pnmraw -sPAPERSIZE=a4 -sOutputFile=- \
        -dTextAlphaBits=4 -dGraphicsAlphaBits=4 - |
    pnmcrop -quiet |
    pnmmargin -white 10 |
    ppmtogif -quiet

Perhaps it would be worth -Thtml using the *AlphaBits options too?

Images produced like this can be seen at
http://www.inputplus.co.uk/troff/prog.html

(Thanks to all those that have sent suggestions for troff.org so far.
I'm working my way through them.)

Cheers,


Ralph.