making gifs automatically
Olivier Gerard
ogerard at ext.jussieu.fr
Wed Nov 6 01:27:44 CET 2002
Le 05, N. J. A. Sloane écrivait:
>
> some one suggested replacing email addresses on my sequence database
> by gifs with email address visible in the gif (to avoid robots
> that harvest email addresses from the web)
>
> Does anyone know how to automatically take a short sentence, say
>
> Jack Smith (js at aol.com)
>
> and produce a gif which displays those words?
>
> Neil
For similar tricks, I often use the gd/freetype libraries which are available
in various computer languages and operating systems.
There are perl libraries available
to interface with it (the server hosting the OEIS has mod_perl
if I remember well). In their standard version they produce PNG
images (free equivalent of GIF). They can be used in CGIs
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