Re: Index of Color Contrast Samples to address issue related to relative luminance

Thank You Jon

On Thu, May 3, 2018 at 8:14 PM Jonathan Avila <jon.avila@levelaccess.com>
wrote:

> I found the page on the web archive that listed colors on different
> backgrounds that passed the contrast test.
>
>
> https://web.archive.org/web/20160424135455/http://trace.wisc.edu:80/contrast-ratio-examples/index.htm
> <https://web.archive.org/web/20160424135455/http:/trace.wisc.edu:80/contrast-ratio-examples/index.htm>
>
> Colors on black
>
>
> https://web.archive.org/web/20160412141115/http://trace.wisc.edu:80/contrast-ratio-examples/TextSamples_6x6x6_On_000000.htm
> <https://web.archive.org/web/20160412141115/http:/trace.wisc.edu:80/contrast-ratio-examples/TextSamples_6x6x6_On_000000.htm>
>
>
>
> Anyway I ran some sample tests (web safe colors) against black and didn’t
> get any differences.  Since we have millions of colors and samples aren’t
> that useful – I decided to write an automated test that would check every
> single color combination and then show me the ones that were different with
> the different relative luminance value.
>
>
>
> The script is here
>
>
> https://github.com/mraccess77/mraccess77.github.io/blob/master/ContrastTest.html
>
>
>
> The problem is that the way I wrote it churns through so much memory that
> it will freeze the browser after a while of chugging through the tests.  So
> far I didn’t see anything come up but we may need to run this a different
> way or use less expensive/optimized code.  So feel free to take a look and
> perhaps do something better.
>
>
>
> Jonathan
>
>
>
> Jonathan Avila
>
> Chief Accessibility Officer
>
> *Level Access*
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