Myndex™ Technologies Web Development
Click Here for the APCA Contrast Calculator
Polarity Example for Anthony:
Contrast polarity is a matter of luminance contrast (∆Y/Y), not color (hue/sat). The term "color contrast" is a misnomer, what is meant in WCAG is "Luminance Contrast."
All five color patches above have the same luminance of 0.31Y which is a perceptual lightness of 62.5L* (Note this is Lstar from LAB, not to be confused with L luminance).
For a large group of examples of reversed polarity stimulus, see Experiment CE15 — SAPC5 (INV) Evaluation
Myndex Perception Research
Myndex Technologies is currently researching perceptual contrast for assessing legibility and accessibility on graphically rich web pages and computer displays.
There is a live issue and discussion at GitHub,
and below are links to some of our live experimental pages, evaluating the issue in detail:
Articles and Help Files
for web design, web app development, and user interface design.
Colorspace that is — several examples of how gradients differ depending on the color space they are calculated in.
A discussion and code examples for determining Luminance, and various methods of determining luminance contrast.
Use this chart as you would a color wheel — only this chart presents the 12 colors in a view matrix so you can easily judge relative color contrast. Also, this chart is adjusted for perceptual uniformity, so the colors are more like pigments in the real world instead of harsh "computer" colors.
The importance of redirects in search engine rankings. While more targeted at server administration than design, this article contains very useful advice on URL consistency for best search engine results.
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