preflashing

preflashing

[prē′flash·iŋ]
(graphic arts)
The uniform exposure of a photographic plate to a small amount of light before its exposure to the image to be photographed.
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References in periodicals archive ?
Another method of hypersensitizing is known as preflashing.
I found that Ilford Pan F and Kodak Technical Pan 2415 behave almost identically when hypered by preflashing.
If you have an reasonably dark observing site, preflashing can be done at the telescope.
Done correctly, preflashing produces high contrast, detailed astrophotographs without the sophisticated equipment and cold storage required for gas-hypered film.