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Recommended weightings for colorimetric calculations *
Author(s) -
Smith Ken J
Publication year - 1998
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1998.tb01941.x
Subject(s) - standard illuminant , weighting , confusion , arithmetic , additive function , observer (physics) , computer science , mathematics , set (abstract data type) , algorithm , statistics , artificial intelligence , psychology , mathematical analysis , medicine , physics , quantum mechanics , psychoanalysis , radiology , programming language
Several different sets of weighting functions are, or have been, in routine use in colour‐measurement systems employed in industry to represent the same pairings of illuminant and observer. Exactly the same inputs to different weight‐sets purporting to represent the same pairing give, often significantly, different outputs (e. g. colour‐difference reports), leading to confusion, arguments between suppliers and their customers, and loss of faith in the capabilities of systems. The extent of variation between weight‐sets is exemplified by those employed, at some time, by some of the major system suppliers to represent TL84. The practical effect of these variations is examined and a recommendation is made to use the weight‐sets in ASTM E308‐96. The relevant content of E308‐96 is summarised and means of determining whether E308‐96 weights are installed in a system are given. Tables of E308‐96 weighting functions for CIE illuminants A, D 65 and F11 (TL84) are appended.