From 5bb833eeea685a660cc9b664420f764ae20a6587 Mon Sep 17 00:00:00 2001
From: Marc Vertes <mvertes@free.fr>
Date: Mon, 25 Aug 2025 15:39:16 +0200
Subject: improve bin/isdarktty

---
 bin/isdarktty | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'bin/isdarktty')

diff --git a/bin/isdarktty b/bin/isdarktty
index 334d8a0..779f6c8 100755
--- a/bin/isdarktty
+++ b/bin/isdarktty
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # Check darkness by computing luminance of the current terminal.
+# see https://en.wikipedia.org/wiki/Luma_(video)
 
 trap "stty $(stty -g)" EXIT
 stty raw -echo min 0 time 0
@@ -11,6 +12,5 @@ awk -v FS='' -v hex=123456789abcdef '{
 	r = (16 * index(hex, $10) + index(hex, $11)) / 255
 	g = (16 * index(hex, $15) + index(hex, $16)) / 255
 	b = (16 * index(hex, $20) + index(hex, $21)) / 255
-	# print 0.33 * r + 0.5 * g + 0.16 * b
-	exit (0.33 * r + 0.5 * g + 0.16 * b > 0.5)
+	exit (0.3 * r + 0.6 * g + 0.1 * b > 0.5)
 }'
-- 
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