P3D Pan film

[Project3D@xxxxxxx]

In a message dated 21/08/98 23:20:33 GMT, Marvin Jones wrote, quoting BobH:

<<  
 >RE: Someone said pan film not available to about 1929...maybe in 
 quantity or retail, BUT panchromatic dyes discovered about 1910 by 
 Fischer et al..an Lumiere Color with pan film and filter mosiac of 
 dyed potato starch grains is from 1913 or so and reached movies  
 and early National Geographic repros. BobH <
 
 I think we're talking about apples and oranges here. "Panchromatic" film
 has nothing to do with color reproduction. It's a black and white film that
 faithfully reproduces the entire spectrum in shades of gray (as opposed to
 "orthochromatic" film, which only saw the red end of the spectrum). Movie
 film was orthochromatic up until the end of the '20s, >>

Err, shouldn't that be that orthochromatic saw everything BUT the red end of
the spectrum? If it were as you state, the red safelights would have fogged
it! :-)

And I think that the point that BobH was making was that to record the full
spectrum in separations that could be reconstructed into full colour, you
would need panchromatic emulsions...

Bob Aldridge


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