Displaying equations in HTML (using transparent gifs)
Like a lot of people, I write my mathematics in latex
and then run
to convert it to HTML for the web.
latex2html renders mathematics as inline images.
We have 3 colors to think of - the mathematics, its background within the image,
and the background of the window.
Ideally, we would like black-on-X-on-X.
One way of achieving this would be to have black-on-(transparent)-on-X.
This is what latex2html does by default.
For various reasons,
many of my pages
use normal, solid, non-transparent, white gifs,
and then a white background.
How to make non-transparent gifs (latex2html switch)
How to make non-transparent gifs (comment latex2html code)
I had some problems with the above switch, so here's an alternative.
I noticed that
latex2html generates normal gifs first
and only then runs a routine to make them transparent.
So I copied the latex2html file itself, edited the make_transparent routine,
and commented out
the relevant lines.
How to convert to other color (netpbm)
You can then convert these images to
a color (non-transparent) other than white,
and then give the pages that color background.
to convert the images:
for i in *.gif
giftopnm $i | pnmdepth 255 | pgmtoppm "#ffffcc" | ppmtogif > tmp.gif
mv tmp.gif $i
How to convert to other color (giftrans)
You can do the same conversion using
giftrans -g white="#ffffcc" $i > tmp.gif