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From: ned@scirtp.UUCP (Ned Robie)
Newsgroups: net.sci,net.rec.photo
Subject: 3D picture on cover of National Geographic
Message-ID: <547@scirtp.UUCP>
Date: Tue, 19-Nov-85 12:10:46 EST
Article-I.D.: scirtp.547
Posted: Tue Nov 19 12:10:46 1985
Date-Received: Thu, 21-Nov-85 07:14:49 EST
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Organization: SCI Systems, Research Triangle Park, NC
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Xref: watmath net.sci:467 net.rec.photo:1638

The cover of the latest National Geographic is a 3D picture of
a skull, and when it's held in the light at the proper angle
the 3D effect is startling.  I know that such pictures are made
with lasers, but what is the process?  Also, how are these
pictures mass reproduced?  The picture on the magazine looks like
silver paper with some black substance on it.  Or is the "black
substance" really an etching of some kind?

Answers would be appreciated.

-- Ned Robie