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Matt McWilliams 2022-07-28 09:53:35 -04:00
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NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md
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@ -908,29 +908,19 @@ Pressing one eyeball produces such superpositions.
## FLASHING ## FLASHING
Double exposing an image with no image -- sere light -- lightens Double exposing an image with no image--mere light--lightens (or with colored light and color print films, colors) the blacks and darker tones while having little effect on middle tones and even less on lights.
(or with colored light and color print filma, colors) the blacks It is not a true method of contrast reduction.
and darker tones while having little effect on middle tones
and even lese on lights. It is8 not a true method of contrast
reduction.
Sepia toning can be simulated by both color flashing and color Sepia toning can be simulated by both color flashing and color filtering when printing B&W original onto color reversal print film.
filtering when printing B&W original onto color reversal print filr
A healthy yellow, magenta, or cyan flash when printing onto color
reversal film yields, respectively, the yellow, magenta, or cyan ~
image, as if this dye layer were prised from the original film.
There ie no photographic method for unflashing a flashed image.
There is image addition (double exposure} and image pultipliocation
(Dipack) and even image division (bipack of positive with
negative), but no image subtraction.
CONTRAST ADJUSTMENT Gammas add or subtract in a bipack, so bipacking A healthy yellow, magenta, or cyan flash when printing onto color reversal film yields, respectively, the yellow, magenta, or cyan image, as if this dye layer were prised from the original film.
can adjust contrast. A bipack (printed gamma 1 or There is no photographic method for unflashing a flashed image.
Viewed raw) of an original with its duplicate is There is image addition (double exposure) and image multiplication (bipack) and even image division (bipack of positive with negative), but no image subtraction.
like a double contrast original. <A bipack of an
original with its low contrast negative is like
~ a darkened reduced contrast original. ## CONTRAST ADJUSTMENT
“fhe bipack of an original with ite high contrast
negative is like a Sabattier solarization! 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.
The bipack of an original with its high contrast negative is like a Sabattier solarization!

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