ISO 5-4 Photography - Density Measurements - Part 4: Geometric Conditions for Reflection Density
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ISO 5-4 Document Information:
Title
Photography - Density Measurements - Part 4: Geometric Conditions for Reflection Density
International Organization for Standardization
Publication Date:
Jan 1, 1995
Scope:
This part of ISO 5 specifies the geometric conditions for measuring
the reflection density of
photographic and graphic art materials.
It specifies illumination at all azimuth angles. These measurements
are not sensitive to
directional reflections from textured surfaces. It does not cover
those situations where light has
been deliberately polarized.
Although intended primarily for use in the measurement of the
reflection characteristics of
processed photographic materials, this part of ISO 5 is also
applicable to the measurement of these
characteristics for other materials.
This part of ISO 5 serves three primary functions:
a) to aid in the calibration and certification of densitometers, or
spectrophotometers used as
densitometers, by allowing for the generation of SRMs (Standard
Reference Materials) with numerical
values traceable to fundamental physical phenomena;
b) to provide the basis for unequivocal measurements that are needed
for specifications,
communication between organizations, and for contractual agreements;
c) to provide a referee function to resolve seemingly different
measurement data between systems.
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