66 lines
2.5 KiB
Plaintext
66 lines
2.5 KiB
Plaintext
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>From: xanthian@saturn.ADS.COM (Metafont Consultant Account)
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Newsgroups: comp.graphics
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Subject: Re: Help w/bitmaps, Computer Graphics Metafile (CGM) etc.
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Message-ID: <10540@saturn.ADS.COM>
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Date: 22 Jan 90 09:51:50 GMT
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Organization: Advanced Decision Systems, Mt. View, CA (415) 960-7300
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Lines: 58
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In article <26147@cup.portal.com> Chris_F_Chiesa@cup.portal.com writes:
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>
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> 2) What is CGM or Computer Graphics Metafile? Is it the same thing? The
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> fellow with the job mentioned "CGM extensions." Is that something
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> above and beyond a "standard" CGM? Or what? I know this "from nothing.
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>
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CGM is:
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A functional specification (semantic standard) for encoding
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computer graphics images for redisplay on one or several supported
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device types, with three encoding (syntactic) standards, one a
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character encoding for minimal size and ease of transmission, one a
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binary encoding for speed of access, and one a clear text encoding
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for human readability and easy editing. It is primarily oriented
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toward stroke drawn graphics, but includes raster bitmap encodings.
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It comprises about 300 pages, softbound. CGM is both an American
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National Standard and an ISO international standard.
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CGM is not:
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A 3D standard, a CAD/CAM data transfer standard (IGES is), nor is it
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a graphic object model data storage standard.
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CGM is called:
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ANSI X3.122-1986
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American National Standard for Information Systems -
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Computer Graphics - Metafile for the Storage and Transfer of
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Picture Description Information
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CGM is available from:
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American National Standards Institute, Inc.
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1430 Broadway, New York, New York 10018
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CGM supports, and is used by, GKS (the Graphical Kernal Standard), but is
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independent from it. CGM is also used as a "least common denominator"
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picture transfer mechanism among many commercial, off the shelf business
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packages, e.g. Harvard Graphics.
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There may well be extensions since the 1986 document, but I am not aware of
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them. In particular, support for GKS-3D is sorely needed.
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Jef, perhaps this should go in your weekly listing; it seems to be asked
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very often. Also, can anyone supply the order number for ANSI, New York?
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--
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Again, my opinions, not the account furnishers'.
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xanthian@well.sf.ca.us xanthian@ads.com (Kent Paul Dolan)
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Kent, the (bionic) man from xanth, now available as a build-a-xanthian
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kit at better toy stores near you. Warning - some parts proven fragile.
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-> METAFONT, TeX, graphics programming done on spec -- (415) 964-4486 <-
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