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7D-32
Modulation transfer function curves
Modulation transfer function
The MFT curve was determined using a method similar
to that described in ANSI PH2.39-1977 (R1990),
Photographic Modulation Transfer Function of
Continuous-Tone Black-and-White Photographic Films,
Method of Measuring.
Diffuse RMS granularity
Determined at a net diffuse density of 1.00, using the
aperture indicated.
These values represent 1,000 times the standard
deviation of density produced by the granular structure
of the material when a uniformly exposed and
developed sample is scanned with a densitometer
calibrated to read American Standard diffuse visual
density, and having a circular measuring aperture with
the indicated diameter.
Granularity is an objective measurement of the spatial
variation of sample density that generally correlates
with graininess, which is the subjective effect of the
image nonuniformity upon an observation when
comparisons are made at the same density level.
Broadly speaking, granularity measurements with the
48-micrometer aperture will indicate the magnitude of
the graininess sensation produced by viewing the
diffusely illuminated sample with 12X monocular
magnification.
It should be noted that if the viewing conditions are
changed from the specified conditions, the published
RMS values may no longer correctly indicate the
relative sensations of graininess produced by various
samples.
Kodak Duplicating Microfilm 2462/4462
Tungsten; Kodak Prostar Plus Developer,
Kodak Prostar Processors; Diffuse Visua
l
Kodak Direct Duplicating Intermediate Microfilm 2470
Kodak Direct Duplicating Microfilm 2468/3468/4468
Tungsten; Kodak Prostar Plus Developer,
Kodak Prostar Processors; Diffuse Visual
Response (%)
Spatial Frequency (cycles/mm) Spatial Frequency (cycles/mm)
NOTE: While the data presented are typical of production coatings, they do not represent standards which must be met by
Eastman Kodak Company. Varying storage, exposure, and processing conditions will affect results. The company
reserves the right to change and improve the product characteristics at any time.
48-Micrometer
Aperture Value
48-Micrometer
Aperture Value
x462 5 15
x468 less than 5 10
2470 less than 5 10
2470
x468