Re: wherefore CGM?

Joel N. Weber II (nemo@koa.iolani.honolulu.hi.us)
Sun, 8 Dec 1996 13:50:51 -1000 (HST)


Date: Sun, 8 Dec 1996 13:50:51 -1000 (HST)
From: "Joel N. Weber II" <nemo@koa.iolani.honolulu.hi.us>
To: David Perrell <davidp@earthlink.net>
cc: Walter Ian Kaye <walter@natural-innovations.com>, www-html@w3.org
Subject: Re: wherefore CGM?
In-Reply-To: <199612082137.NAA17605@greece.it.earthlink.net>
Message-ID: <Pine.SOL.3.91.961208134723.8214B-100000@koa.iolani.honolulu.hi.us>

On Sun, 8 Dec 1996, David Perrell wrote:

> Binary CGM is a relatively compact representation of 2D objects on a
> plane, and includes vectors, regular shapes, spline curves, and bitmap
> tiling. It's good for representing images composed of lines and filled
> shapes. Diagrams and maps that now must be represented as huge bitmaps
> could be a fraction of the size in CGM, and users could zoom into such
> drawings for greater detail.
> 
> 3DMF may be an efficient representation of both 2D and 3D objects, but
> all objects exist in a 3D coordinate system. In addition to object
> shape and color, surface characteristics, viewport, and lighting must
> be considered.
> 
> The next version of PostScript may have a more efficient binary
> incarnation, but CGM might still have more pre-defined elements and
> therefore smaller file sizes.

You still haven't answered my question: if you strip the preview from
the encapsulated postscript and gzip it, how will the size compare
to a binary CGM?  CGM might still be a win, but it won't be as drastic.

> I still say universal graphical UA support for inline CGMs would be a
> good thing (though if the spec is unavailable anywhere but from the
> grasping toll-takers of the ISO I might reconsider).

My understanding is that if you want the spec, you'll have to pay a lot
of money.

However, I'm currently thinking that E-scape will support inline
CGM files using gplot.  My main concern is that the version of
gplot I found doesn't compile easily, at least on Linux, but I
suspect that issue will be resolved eventually.

nemo
                                                 http://www.cyclic.com/~nemo
<nemo@koa.iolani.honolulu.hi.us>                    <devnull@gnu.ai.mit.edu>
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