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sufficient color contrast

for

From: Marek Prokop
Date: Aug 19, 2003 12:10PM

Hi All,

The Techniques For Accessibility Evaluation And Repair Tools,
particularly the Technique 2.2.1

http://www.w3.org/TR/AERT#color-contrast

states that the brightness difference between background and
foreground color should be at least 125 (according to the
formula given in that checkpoint) to ensure sufficient color
contrast. Is this really sufficient difference? 125 is only 49%
of 255 (what is the most possible brightness difference) and I
read somewhere (unfortunately don't remember where) that at
least 80% brightness difference is necessary.

In fact, on my old monitor, even the difference of 154 is not
enough. 80% would equal 204, what seems to be OK.

Regards,

Marek Prokop



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