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Font lookup table revised, still for 0.98G 4g constants. General (all use case) lookup table.
Font lookup table revised, still for 4G constants. Now available as arrays in the DATA folder.
Font lookup table revised, still for 4G constants.
All W3 licensed files moved to their own repository, AND A new npm package has been released (of the W3 version) to ease integration!!
Updated font LUT, and adding a 0. for semantic versioning (0.0.98G)
0.0.98G-4g is the current version. A minimal APCA version is in the JS folder.
IMPORTANT: If you are making a tool to predict contrast for the new W3 standards for Visual Contrast, use only the files named APCA.
The new version of the basic APCA javascript file is uploaded, and the main directory readme.md has been updated with the latest maths and code examples. Variable names and values have changed. The key constants have not changed since February 15, 2021, and they are:
Exponents: mainTRC: 2.4 normBG: 0.56 normTXT: 0.57 revTXT: 0.62 revBG: 0.65
Scalers: Scale: 1.14 loBoWthresh: 0.035991 loBoWoffset: 0.027 loBoWfactor: 27.7847239587675
Clamps: blkThrs: 0.022 blkClmp: 1.414 loClip: 0.001 deltaYmin: 0.0005
The sRGB coefficients are:
Rco = 0.2126729;
Gco = 0.7151522;
Bco = 0.0721750;
PREVIOUS
The new version of the basic APCA javascript file is uploaded, and the main directory readme.md has been updated with the latest maths and code examples. Variable names and values have changed. The key constants are now:
Exponents: mainTRC: 2.4 normBG: 0.55 normTXT: 0.58 revTXT: 0.57 revBG: 0.62
Scalers: Scale: 1.25 loConThresh: 0.078 loConOffset: 0.06 loConFactor: 12.82051282051282
Clamps: blkThrs: 0.03 blkClmp: 1.45 loClip: 0.001 deltaYmin: 0.0005
Also changed the R,G,B coefficients to the less rounded matrix versions for better future compatibility.
Rco = 0.2126729;
Gco = 0.7151522;
Bco = 0.0721750;
Substantial code changes, including math and scaling. Literally all constants have changed. Typically the "equivalent colors" will be indicated 20 lower (more or less). The main takeaway here though is what was 100 is now 80, what was 80 is now 60 and what was 60 is now 40.
80: The general target for columns of body text.
60: The general target for most content text.
IMPORTANT: Major reworking of the input objects, adding new methods including a complete CIE suite, piecewise sRGB processing, and much more. This file is INCOMPATIBLE WITH ALL PREVIOUS VERSIONS due to new features, naming, and organizing of properties and methods.
Only applies to the JS files with the input parsing. Fixed the "Zero Hex Bug" thanks to Mitch @mfishma issue #5 for pointing it out!
Changes in the .JS files mainly centered around adding new methods and also adding new parsing, including for alpha channels.
New input feature: you only need to enter 2 hex digits to get a color, and it auto updates as you add more - 3,4,6,8 - if wen you enter two, such as e9, you are returned #e9e9e9. helpful for quickly toggling through grays.
New color object data returns include L* and methods for returning alpha data.
Changes in the .HTML files
Remember there's a lot of useful JS in the HTML documents as well, and the latest in terms of the new multi-level scoring model. The font samples section is substantially cleaned up and revised to reflect the latest guidelines.
Fixed constant for Green coefficient — should be: const Gco = 0.7152; and not 0.7156 (lingering typo does not materially affect results but was nevertheless wrong.)
ALSO: Changed all power functions from the shorthand ** to the more standard Math.pow() for better compatibility.
Added "APCAsRGBonly.js — this is the APCA algorithm only, suitable if you already have color parsing and just want to add the ACPA function. This version takes sRGB encoded 8 bit integers from 0-255.
Code cleanup in the JS files. The loConRamp moved to a separate function. HTML files have an improved UX for the manual color entry fields.
Split the "APCA" version from the "SAPC" version. The APCA is intended for the forthcoming W3 accessibility standards (Silver/WCAG 3). The SAPC is the research version, which may not be in conformance due to experimental variations.
To any “early adopting” developers:
Priority: HIGH — Affects Results If you are not interested in the low-contrast extension, then there is just one change that is important:
Change the const blkClmp from 1.75 to 1.33
This affects the results whenever the darker color is less than #2c2c28.
`const blkClmp = 1.75; // OLD Exponent for the soft black clamp curve`
`const blkClmp = 1.33; // NEW Exponent for the soft black clamp curve`
Also just FYI, SAPC is the research name and SAPC is licensed under AGPL v3. APCA is the release name in the new Working Draft of Silver/WCAG 3, and licensed to the W3 per their collaborative agreements.
Please feel free post issues or comments.