Fix: Text color selection for given background now takes into account human perception. (#820)

Author: kosumosu

src/utils.ts

@@ -112,7 +112,7 @@ export function computeColor(color: string): string {
 
 export function computeTextColor(backgroundColor: string): string {
   const colorObj = new TinyColor(backgroundColor);
-  if (colorObj.isValid && colorObj.getLuminance() > 0.5) {
+  if (colorObj.isValid && colorObj.isLight()) {
     return '#000'; // bright colors - black font
   } else {
     return '#fff'; // dark colors - white font