From: Barry Warsaw <barry@python.org>
Date: Mon, 28 Sep 1998 23:39:18 +0000 (+0000)
Subject: triplet_to_brightness(): New function
X-Git-Tag: v1.5.2a2~228
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0e3e6991787f869a684066bc54c58f29cd7f1c9f;p=python

triplet_to_brightness(): New function
---

diff --git a/Tools/pynche/ColorDB.py b/Tools/pynche/ColorDB.py
index fae0a3bed7..a4c834227a 100644
--- a/Tools/pynche/ColorDB.py
+++ b/Tools/pynche/ColorDB.py
@@ -174,6 +174,15 @@ def triplet_to_fractional_rgb(rgbtuple):
     return map(operator.__div__, rgbtuple, _maxtuple)
 
 
+def triplet_to_brightness(rgbtuple):
+    # return the brightness (grey level) along the scale 0.0==black to
+    # 1.0==white
+    r = 0.299
+    g = 0.587
+    b = 0.114
+    return r*rgbtuple[0] + g*rgbtuple[1] + b*rgbtuple[2]
+
+
 
 if __name__ == '__main__':
     import string