Unitary Suprathreshold Color-Difference Metrics of Legibility for CRT raster Imagery

Authors: Thomas M. Lippert; Harry L. Snyder; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG HUMAN FACTORS LAB

Abstract:

This research examined the relationships between color contrast and legibility for digital raster video imagery. CIE colorimetric components were combined into three-dimensional color coordinate systems whose coordinates map one-to-one with the physical energy parameters of all colors. The distance between any two colors' coordinates in these 3-spaces is termed Color-Difference (Delta E). Delta A was hypothesized as a metric of the speed (RS) with which observers possessing normal vision could accurately read random numeral strings on one color displayed against backgrounds of another color. Two studies totalling 32064 practice and experimental trials were conducted. The first study determined that the CIE Uniform Color Spaces are inappropriate for the modelling of RS. Subsequently, a different 3-space geometry and colorimetric component scaling were empirically derived from the Study 1 data to produce a one- dimensional Delta E scale which approximates an interval scale of RS. This Delta E scale and others were then applied to the different stimulus conditions in Study 2 to determine the generalizability of such Delta E metrics.

Description:

Technical rept. 1982-1985

Pages:

107

Report Date:

SEP 86

Contract Number:

N00014-78-C-0238

Report Number:

A260571

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