From aa423334b861e4f5f032db4d5ce5148409f3ee33 Mon Sep 17 00:00:00 2001
From: Alvin Penner <penner@vaxxine.com>
Date: Mon, 14 Apr 2014 15:03:31 -0400
Subject: extensions. color_blackandwhite. add option for color threshold (Bug
 1306420)

Fixed bugs:
  - https://launchpad.net/bugs/1306420

(bzr r13284)
---
 share/extensions/color_blackandwhite.inx | 1 +
 share/extensions/color_blackandwhite.py  | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/share/extensions/color_blackandwhite.inx b/share/extensions/color_blackandwhite.inx
index 8432ab2d3..0fa58a128 100644
--- a/share/extensions/color_blackandwhite.inx
+++ b/share/extensions/color_blackandwhite.inx
@@ -5,6 +5,7 @@
 	<dependency type="executable" location="extensions">coloreffect.py</dependency>
 	<dependency type="executable" location="extensions">color_blackandwhite.py</dependency>
 	<dependency type="executable" location="extensions">simplestyle.py</dependency>
+	<param name="threshold" type="int" min="1" max="255" _gui-text="Threshold Color (1-255):">127</param>
 	<effect>
 		<object-type>all</object-type>
 		<effects-menu>
diff --git a/share/extensions/color_blackandwhite.py b/share/extensions/color_blackandwhite.py
index 57e6e2ae8..fcee057c7 100755
--- a/share/extensions/color_blackandwhite.py
+++ b/share/extensions/color_blackandwhite.py
@@ -2,12 +2,19 @@
 import coloreffect,sys
 
 class C(coloreffect.ColorEffect):
+  def __init__(self):
+    coloreffect.ColorEffect.__init__(self)
+    self.OptionParser.add_option("-t", "--threshold",
+                                 action="store", type="int",
+                                 dest="threshold", default=127,
+                                 help="Threshold Color Level")
+
   def colmod(self,r,g,b):
     #ITU-R Recommendation BT.709
     #l = 0.2125 * r + 0.7154 * g + 0.0721 * b
     #NTSC and PAL
     l = 0.299 * r + 0.587 * g + 0.114 * b
-    if l > 127:
+    if l > self.options.threshold:
        ig = 255
     else:
        ig = 0
-- 
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