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photographic density


  • WordNet 3.6
    • n photographic density (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
    • ***


In literature:

A simple, though rough, scale of visibility may be made by using a series of photographic screens of different densities.
"Visual Illusions" by Matthew Luckiesh

In science:

The discrepancy may be due to differences in CCD vs. photographic detection techniques, some other selection difference, or real differences in the QSO number density, but the issue is unresolved.
QSOs and Absorption Line Systems Surrounding the Hubble Deep Field