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Re: Apple's SVG patent

From: Glenn Randers-Pehrson <glennrp@home.com>
Date: Thu, 04 Oct 2001 08:35:14 -0400
Message-Id: <>
To: www-patentpolicy-comment@w3.org
Chris Lilley wrote:
>Go read the patent, please. They have patented using a pair of color
>images as alpha channels. This might or might not have prior art (it
>might well, and I would encourage people to report it) but it is not the
>same as 'patenting bitbasks'

OK, look at pnmcomp.c, dated 1992, in the NetPBM tools.  It does precisely
what Apple's abstract says, using a separate file for the alphamap.

Received on Thursday, 4 October 2001 08:38:02 UTC

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