Halftones

[P3D Marvin Jones <72657.3276@xxxxxxxxxxxxxx>]

> Peter Davis writes
> >practice of halftoning was originally done by projecting a photograph
> >through a piece of glass with a finely etched grid of lines.  The
> >transmission properties of that grid resulted in the halftoning effect. 
The
> >piece of glass had no intelligence or algorithm to accomplish it.
> 
> Gregory J. Wageman writes
> >That's not halftoning.  I'm not sure what it is (besides possibly
> >just an 'effect') but it isn't halftoning.
> 
When I worked for a time in a print shop many years ago, that's exactly how
we created halftones, except we used a sheet of plastic gel with a fine dot
pattern of a certain density, depending on the dpi we wished to achieve in
the final product. My boss at the time had been producing them that way
since the '20s, and I know they are still produced that way now. In fact,
I've never heard of any other method of producing them!


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