use correct WCAG luminance constant (fixes #248)

Qix- · Apr 5, 2022 · f34a0ba · f34a0ba
1 parent 4ac1315
commit f34a0ba
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/index.js b/index.js
@@ -267,7 +267,7 @@ Color.prototype = {
 		const lum = [];
 		for (const [i, element] of rgb.entries()) {
 			const chan = element / 255;
-			lum[i] = (chan <= 0.039_28) ? chan / 12.92 : ((chan + 0.055) / 1.055) ** 2.4;
+			lum[i] = (chan <= 0.040_45) ? chan / 12.92 : ((chan + 0.055) / 1.055) ** 2.4;
 		}
 
 		return 0.2126 * lum[0] + 0.7152 * lum[1] + 0.0722 * lum[2];