From 8d55aca6eae02415e3ef2f7841dc96b117d56324 Mon Sep 17 00:00:00 2001
From: markwbrown <markbr.wn@gmail.com>
Date: Mon, 21 Mar 2016 20:42:58 -0700
Subject: [PATCH 1/2] Update color_diff.py

Default CIEDE200 changed to use unity 1 in Kl, Kc, Kh without passing as args.

delta_e_cie2000_nonunity(color1, color2, Kl, Kc, Kh) proposed as new function to allow for passing in Kl, Kc, Kh in instances which a different weighting factor, or nonunity weighting factors are desired.
---
 colormath/color_diff.py | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/colormath/color_diff.py b/colormath/color_diff.py
index 891acae..42bda01 100644
--- a/colormath/color_diff.py
+++ b/colormath/color_diff.py
@@ -69,9 +69,20 @@ def delta_e_cie1994(color1, color2, K_L=1, K_C=1, K_H=1, K_1=0.045, K_2=0.015):
         color1_vector, color2_matrix, K_L=K_L, K_C=K_C, K_H=K_H, K_1=K_1, K_2=K_2)[0]
     return numpy.asscalar(delta_e)
 
+# noinspection PyPep8Naming
+def delta_e_cie2000(color1, color2):
+    """
+    Calculates the Delta E (CIE2000) of two colors.
+    """
 
+    color1_vector = _get_lab_color1_vector(color1)
+    color2_matrix = _get_lab_color2_matrix(color2)
+    delta_e = color_diff_matrix.delta_e_cie2000(
+        color1_vector, color2_matrix, Kl=1, Kc=1, Kh=1)[0]
+    return numpy.asscalar(delta_e)
+    
 # noinspection PyPep8Naming
-def delta_e_cie2000(color1, color2, Kl=1, Kc=1, Kh=1):
+def delta_e_cie2000_nonunity(color1, color2, Kl, Kc, Kh):
     """
     Calculates the Delta E (CIE2000) of two colors.
     """

From 149e69ab4f29c5bd7a20180bfa53809103df81db Mon Sep 17 00:00:00 2001
From: markwbrown <markbr.wn@gmail.com>
Date: Mon, 21 Mar 2016 22:02:03 -0700
Subject: [PATCH 2/2] DECIE2000 depreciation warning

Rolled back delta_e_cie2000 to original with depreciation warning. delta_e_cie2000_update added as reference to know what to expect in a future release.
---
 colormath/color_diff.py | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/colormath/color_diff.py b/colormath/color_diff.py
index 42bda01..022229c 100644
--- a/colormath/color_diff.py
+++ b/colormath/color_diff.py
@@ -70,17 +70,27 @@ def delta_e_cie1994(color1, color2, K_L=1, K_C=1, K_H=1, K_1=0.045, K_2=0.015):
     return numpy.asscalar(delta_e)
 
 # noinspection PyPep8Naming
-def delta_e_cie2000(color1, color2):
+def delta_e_cie2000(color1, color2, Kl=1, Kc=1, Kh=1):
     """
     Calculates the Delta E (CIE2000) of two colors.
     """
-
+    from warnings import warn
+    warn("The current form of this class being depreciated in favor of not passing in arguments for Kl, Kc, and Kh when unity 1 is used. For applications wishing to retain the ability to change Kl, Kc, and/or Kh from default value of 1 see delta_e_cie_2000_nonunity. In a future release, the updated format as seen in delta_e_cie2000_update will be used")
     color1_vector = _get_lab_color1_vector(color1)
     color2_matrix = _get_lab_color2_matrix(color2)
     delta_e = color_diff_matrix.delta_e_cie2000(
-        color1_vector, color2_matrix, Kl=1, Kc=1, Kh=1)[0]
+        color1_vector, color2_matrix, Kl=Kl, Kc=Kc, Kh=Kh)[0]
     return numpy.asscalar(delta_e)
     
+def delta_e_cie2000_update (color1, color2):
+    """
+    Calculates the Delta E (CIE2000) of two colors.
+    """
+    color1_vector = _get_lab_color1_vector(color1)
+    color2_matrix = _get_lab_color2_matrix(color2)
+    delta_e = color_diff_matrix.delta_e_cie2000(
+        color1_vector, color2_matrix, Kl=1, Kc=1, Kh=1)[0]
+    return numpy.asscalar(delta_e)    
 # noinspection PyPep8Naming
 def delta_e_cie2000_nonunity(color1, color2, Kl, Kc, Kh):
     """