Relationship between grain and resolution
As with resolution and other dimensions
of film performance, it is possible to quantify grain. Describing it
numerically involves using the RMS granularity number. This number is
often accompanied by a descriptive verbal classification of each film.
Following are the general classifications both in RMS numbers and their
equivalent descriptive classifications:
Grain and resolution might be categorized
as separate entities but in reality they are rather interdependent.
While there are no absolute international standards by which to measure
graininess, (RMS) Diffuse Root Mean Square granularity values are the
ones most commonly quoted. Comparing RMS numbers across film
categories, such as between color print and slide film, is much like
comparing apples and oranges. It is not a meaningful measure in any
sense. In order to get any useful information about relative
granularity, you must compare apples with apples and oranges with, you
guessed it, oranges. Therefore, compare only slide films with other
slide films, color print films with other print films, and so on.
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