A colour notation conversion program

Abstract

A computer program has been developed that converts between the notations of the Munsell, OSA‐UCS, NCS, DIN, and Coloroid colour order systems and the CIE, CIELAB, and CIELUV colour specification systems. The intention of this article is to outline the development of this program and its structure. Particular attention is given to the accuracy of the program and its associated databases.

Popular colour order systems

“…OSA-UCS atlas samples were mapped on to other colour spaces to check the perceptual spacing of the respective colour atlases. They observed that (Smith et al , 1990d) for mutual conversion between the Munsell, OSA-UCS, NCS, DIN, Coloroid and CIE systems. The conversion was based on the principle that the colour order systems are defi ned by their aim points defi ned by the CIE coordinates.…”

Virtual colour: Communication standard and analytical tool

“…However, the accuracy of the conversion ustween computer generated and atlas samples (as the samples deviate from their intended aim points and may vary ing neural nets is much lower, for the Munsell system this has been recorded as 1.36 CIELAB units as opposed between different copies and editions of an atlas); and limitations in the models of colour space that the specifito an average of 0.11 CIELAB units for the interpolation/ extrapolation method. 33,34 cation systems are based upon (see the section on Colour Psychology). A number of problems exist with conversion strategies that depend upon colorimetric data due to specification or measurement differences between the two systems, Technology Issues notably: CIE illuminant (usually C or D65), CIE standard observer (1931 or 1964 standard), aim or actual (mea-A number of technological issues arise concerning CRTs and colour printers that impinge upon colour accuracy.…”

A colour notation conversion program revisited

“…Colorcurve aim colour space is defined by equations based upon CIELAB reference points: conversion from Colorcurve aim to CIE colour space is achieved by use of these equations. Equations (1) and (3) define the relationship between Colorcurve aim colour space and CIE X and 2 tristimulus values, respectively. Colorcurve lightness is equivalent to CIELAB lightness.…”

“…The internal consistency of the colour notation conversion program in CIELAB colourdifference units. Conversion statistics were determined using the same 47 Munsell reference points as detailed in Ref 1…”