Digest member Michael Sands wrote me today:

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I restore antique and not so antique pinball machines.  The most
difficult part is the cosmetics of the backglass art work, as the ink
often flakes off the glass.

I have perfected a method of scanning in portions, often six or nine
segments, of the glass and then "stitching" them together using
software.  I have done several 300 dpi images this way and manage to
get them within a pixel or so.

A larger disc can be scanned in segments, with joining indicators
marked.  Then the multiple images can be carefully joined into a large
image.  The only problem is the labor intensive nature of the process.

Let me know if you need more details.

Michael Sands¶
sands@dnai.com¶
http://www.dnai.com/~sands/

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The finished image of the pinball machine art is either 17x17 or
19x19 inches square, at 300 dots per inch.  He says he uses one
of the popular image manipulating programs used by artists for
computer graphics manipulation.

-- Robbie Rhodes