From f88725a7ab558585f2ca23864e7ecf4a0bff8312 Mon Sep 17 00:00:00 2001
From: s <s.looi2@outlook.com>
Date: Mon, 9 Sep 2024 01:10:26 +0900
Subject: [PATCH] :memo: add source for formulas

---
 src/main.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main.ts b/src/main.ts
index 48caf47..edc3319 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,5 +1,7 @@
 import './style.css'
-// https://stackoverflow.com/questions/596216/formula-to-determine-perceived-brightness-of-rgb-color
+// source: https://stackoverflow.com/questions/596216/formula-to-determine-perceived-brightness-of-rgb-color
+// source: https://www.w3.org/TR/AERT/#color-contrast
+
 class ClipboardFileListener {
   constructor(callback: (imgData: string | ArrayBuffer) => any) {
     document.addEventListener("paste", event => {