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Chrome Color Contrast Analyzer

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From: Alan Zaitchik
Date: Aug 9, 2016 8:10PM

I cannot tell whether certain pages pass or fail the 4.5:1 contrast requirement. Using the Chrome Color Contrast Analyzer I get results such as what is depicted at
http://test.courseware.c4designlabs.com/moodle/screenshot01.html. (This was using a pixel radius of 2, not that other values made much of a difference.)
It seems to me that the text is not really legible. But what counts as "legible" ? Sometimes the text is illegible altogether, but often it is possible to figure it out with some effort. So the test is hardly "automatic".
Does anyone have advice, perhaps a better tool, that can take a fully rendered html page or a selected part of the page, and tell if text is adequately contrastive with its background (at 4.5:1 or 3:1) ? If we keep with the Chrome tool, what criteria should we use to make these judgment calls?
Thanks,
Alan