update YIQ formula constants (fixes #107, ref chartjs#2)

Qix- · Apr 5, 2022 · 9dcc3b7 · 9dcc3b7
1 parent f34a0ba
commit 9dcc3b7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/index.js b/index.js
@@ -298,7 +298,7 @@ Color.prototype = {
 	isDark() {
 		// YIQ equation from http://24ways.org/2010/calculating-color-contrast
 		const rgb = this.rgb().color;
-		const yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
+		const yiq = (rgb[0] * 2126 + rgb[1] * 7152 + rgb[2] * 722) / 10_000;
 		return yiq < 128;
 	},