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| https://twitter.com/A11yReadTech | |
| Readability Criterion | https://readtech.org |
| APCA calculator | https://apcacontrast.com |
| Colorblind Simulator | https://www.myndex.com/CVD/ |
I'm working on a #SwiftUI view modifier that calculates a foreground Color that maintains sufficient contrast with the background and also takes the font into account. This can improve #accessibility without too much design-time overhead.
It's using APCA by @Myndex.
Elaborating on this a bit more, looking at the version with the solid bars connecting the in and out-of-shadow dots.
These bars are each the same color throughout, but notice on the grey bar that it appears to have a gradient in the area where it crosses the shadow.
The few places APCA passes colors that WCAG 2 contrast rejects, are cases where the rejected colors are actually better for those with color vision deficiency.
In other words, WCAG 2 contrast isn't just wrong, its results can negatively impact readability.
APCA substantially exceeds WCAG2 contrast in terms of actual accessibility, especially for dark mode.
WCAG 2 contrast SCs are essentially unusable for dark mode, and can be harmful to actual accessibility & readability. The fact that the EU is putting WCAG2 contrast into law is unfortunate.
WCAG 2 contrast is not based on any relevant readability research. WCAG 2 contrast is not peer reviewed, and the statements made in the understanding doc lack scientific support.
APCA is a key part of the APCA Readability Criterion, published by Inclusive Reading Technologies.
APCA is a key part of the APCA Readability Criterion, the draft standard from the non-profit Inclusive Reading Technologies, Inc.
APCA is part of the APCA Readability Criterion, an open standard available from Inclusive Reading Technologies, Inc. A California non-profit, dedicated to science-based standards and research to improve readability for all.
Indeed: If color management is enabled (on any system, Win/Mac/Lix) the dropper may provide unpredictable results. Choosing a default sRGB profile while using the picker may help mitigate issues.
Better to use a stand alone dropper tool that is color management aware.
For MacOS, that's "Classic Color Meter" desktop app.
Discussion and best practices in our draft guidelines:
https://readtech.org/ARC/tests/visual-readability-contrast/?tn=methods#tool-setup
robb
Myndex 🔵
Marc Edwards