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Raster image to file



I have no doubt that this has been asked before, but I don't know the
answer and I thought someone out there would.  I would like to dump
a color screen to a file in a way analogous to <function-Q>.  I would
be happy with any format which could then be redisplayed, but I would
need a description of the format (the files may be displayed on an X
server).  Could someone explain how to do this or send the code 
necessary?

Thanks

David Loewenstern
AT&T Bell Laboratories
14B-253 
Whippany, NJ 07981
email: davel@whutt.att.com || whutt!davel
at&t: 201-386-6516