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Add part of Color Image Superposition (sic) section. No compile.

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Matt McWilliams 2022-07-30 13:01:45 -04:00
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NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md
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@ -923,4 +923,20 @@ There is image addition (double exposure) and image multiplication (bipack) and
Gammas add or subtract in a bipack, so bipacking can adjust contrast. A bipack (printed gamma 1 or viewed raw) of an original with its duplicate is like a double contrast original. Gammas add or subtract in a bipack, so bipacking can adjust contrast. A bipack (printed gamma 1 or viewed raw) of an original with its duplicate is like a double contrast original.
A bipack of an original with its low contrast negative is like a darkened reduced contrast original. A bipack of an original with its low contrast negative is like a darkened reduced contrast original.
The bipack of an original with its high contrast negative is like a Sabattier solarization! The bipack of an original with its high contrast negative is like a Sabattier solarization!
## COLOR IMAGE SUPERPOSITION
There are the same three basic types.
Double exposure from positives gives additive color mixture.
Bipacking gives so-called subtractive color mixture.
When bipacking color negatives the extra orange mask should be neutralized by filtering.)
Double exposure from negatives gives something else.
For greys in the two images, combination is as for B&W.
But for colors, not only are new colors produced but apparent brightnesses do not combine quite the same ae for B&W.
The dyes in Wratten CC filters Y, M, C are similar to those in color films.
Film colors can be simulated by packs of these filters and much can be learned about film color manipulation from familiarity with the filters and their combinations.