From 0e3e6991787f869a684066bc54c58f29cd7f1c9f Mon Sep 17 00:00:00 2001 From: Barry Warsaw Date: Mon, 28 Sep 1998 23:39:18 +0000 Subject: [PATCH] triplet_to_brightness(): New function --- Tools/pynche/ColorDB.py | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Tools/pynche/ColorDB.py b/Tools/pynche/ColorDB.py index fae0a3bed7d..a4c834227a0 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