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Colour‐difference ellipsoids for five CIE colour centres
Author(s) -
Cheung M.,
Rigg B.
Publication year - 1986
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.5080110305
Subject(s) - chromaticity , mathematics , colour difference , ellipsoid , color difference , ellipse , lightness , significant difference , scale (ratio) , statistics , artificial intelligence , optics , geometry , computer science , geography , physics , geodesy , cartography , enhanced data rates for gsm evolution
Following the CIE guidelines for coordinated research on colour‐difference evaluation, sets of dyed wool samples were produced near each of the five CIE reference colours, the colour differences within each set ranging from 1 to 9 CIE‐LAB units. Ratio assessments were used to determine discrimination ellipsoids for illuminants D 65 and A. Ratio and grey‐scale assessments involving pairs from all five colours were used to bring the visual data onto a common scale consistent with previous results. The ellipsoids for the red and green centres were compared with those obtained previously for the same centres. The agreement was rather better for the green colour, even though the substrates and sizes of colour‐differences were different in this case. The chromaticity‐discrimination ellipses generally agreed well with those obtained earlier for similar colours. The CMC (1 : 1) formula agreed better with the experimental results than did the CIELAB formula.