[Athen] color contrast luminosity vs. difference in color brightness

Howard Kramer hkramer at colorado.edu
Tue Oct 21 12:52:52 PDT 2014

Hello All:

I notice that Gez Lemon's color contrast analyzer checks for both *color
luminosity contrast* and *difference in color brightness*. However, WCAG
2.0 seems to have no reference to color brightness contrast although color
brightness contrast is addressed specifically in 1.4.3 Contrast (Minimum)
(found under Guideline 1.4 Distinguishable: Make it easier for users to see
and hear content including separating foreground from background
<http://www.w3.org/TR/WCAG20/#visual-audio-contrast>. Just wondering why.
Is color brightness contrast less important?


Howard Kramer
*Promoting the Integration of Universal Design into University Curricula*
Lecturer, Cont. Ed - Evening & Cred Admin
cell: 720-351-8668
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