Re: Support for Vector Images

David Perrell (davidp@earthlink.net)
Sat, 29 Nov 1997 19:19:42 -0800


From: "David Perrell" <davidp@earthlink.net>
To: <www-html@w3.org>, <www-style@w3.org>
Date: Sat, 29 Nov 1997 19:19:42 -0800
Message-ID: <01bcfd3e$ccf5ed00$831cd9cf@davidp>
Subject: Re: Support for Vector Images


Clive Bruton wrote:


>Peter Flynn wrote at 28/11/97 2:34 pm
>
>>EPS is not necessarily vector-based, it can contain bitmaps too.
>
>I think that's an additional advantage, rather than a disadvantage, how
>else could you have bitmaps with clipping paths?


I believe CGM (Computer Graphics Metafile) supports clipping paths. It
certainly can use bitmaps as texture fill, which is basically the same
thing. A CGM can contain vector graphics (e.g., polylines, ellipses, NURBS),
raster graphics (e.g., tile array), and text.[1]

Postscript is a page description language; an EPS file is actually an
interpreted program. CGM is a graphics file format. CGM files require less
processing overhead to display. They also require less bandwidth to move
around. I did a comparison of image formats as exports from CorelDRAW!. A
simple logo was 1.5k bytes as a CGM file. It was 24k as an EPS.

David Perrell

[1] http://speckle.ncsl.nist.gov/~lsr/cgm_std.htm