[7480] in www-talk@info.cern.ch
RE: Transparent GIFs
daemon@ATHENA.MIT.EDU (Steve Cameron)
Thu Feb 2 06:43:29 1995
Date: Thu, 2 Feb 1995 12:17:53 +0100
Errors-To: listmaster@www0.cern.ch
Reply-To: stevecam@interactive.net
From: Steve Cameron <stevecam@interactive.net>
To: Multiple recipients of list <www-talk@www0.cern.ch>
Many thanks to all who responded with a multitude of suggestions and
hints for layering GIFs on an HTML page. We'll try a few. In truth,
after working w/HTML for a couple of years, I'm still a bit skeptical
that this effect can actually be achieved.
/Steve Cameron
On Wed, 1 Feb 1995 bede@scotty.mitre.org wrote:
> Date: Thu, 2 Feb 1995 01:28:52 +0100
> From: Steve Cameron <stevecam@interactive.net>
>
> While we're in the GIF neighborhood, is anyone aware of a method to create
> transparent GIF files to be used with a browser to give a layered
> effect??
>
> The short answer is to use netpbm (formerly called pbmplus), which I
> think you can get from ftp.x.org. Here's a very simple little script
> which takes a GIF image and makes the color white transparent in the
> output (with the file arg renamed with "T_" as a prefix).
>
>
> - Bede McCall <bede@mitre.org>
>
> The MITRE Corporation Tel: (617) 271-2839
> Bedford, Massachusetts FAX: (617) 271-2423
>
>
> #!/bin/csh
> #
> # Make a "tranparent-background" GIF image.
> #
> /bin/cat $1 | /usr/local/pbmplus/bin/giftoppm | /usr/local/pbmplus/bin/ppmtogif -transparent white > T_$1
>
