From 763884f1a5fd3c98e53112f2d136b7e5ecea3343 Mon Sep 17 00:00:00 2001
From: Tomas Musil <tomik.musil@gmail.com>
Date: Mon, 25 Nov 2013 00:16:38 +0100
Subject: [PATCH] color auto levels

---
 imago_pack/filters.py | 33 ++++++++++++++++++++++++++++++---
 imago_pack/intrsc.py  |  7 ++++++-
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/imago_pack/filters.py b/imago_pack/filters.py
index 8c1c21b..3a64039 100644
--- a/imago_pack/filters.py
+++ b/imago_pack/filters.py
@@ -2,13 +2,40 @@ from PIL import Image, ImageFilter
 
 import pcf
 
+def color_enhance(image):
+    image_l = image.load()
+    min_r, min_g, min_b = 999, 999, 999
+    max_r, max_g, max_b = -1, -1, -1
+
+    for x in xrange(image.size[0]):
+        for y in xrange(image.size[1]):
+            min_r = min(min_r, image_l[x, y][0])
+            max_r = max(max_r, image_l[x, y][0])
+            min_g = min(min_g, image_l[x, y][1])
+            max_g = max(max_g, image_l[x, y][1])
+            min_b = min(min_b, image_l[x, y][2])
+            max_b = max(max_b, image_l[x, y][2])
+
+    new_image = Image.new('RGB', image.size)
+    new_image_l = new_image.load()
+    for x in xrange(image.size[0]):
+        for y in xrange(image.size[1]):
+            r, g, b = image_l[x, y]
+            r = (r - min_r) * 255 / (max_r - min_r)
+            g = (g - min_g) * 255 / (max_g - min_g)
+            b = (b - min_b) * 255 / (max_b - min_b)
+            new_image_l[x, y] = (r, g, b)
+           # print min_r, max_r, r, g, b
+
+    return new_image
+
 def edge_detection(image):
-    image = image.filter(ImageFilter.GaussianBlur())
+    new_image = image.filter(ImageFilter.GaussianBlur())
     # GaussianBlur is undocumented class, it might not work in future versions
     # of PIL
-    image = Image.fromstring('L', image.size,
+    new_image = Image.fromstring('L', image.size,
                              pcf.edge(image.size, image.tostring()))
-    return image
+    return new_image
 
 def peaks(image):
     image_l = image.load()
diff --git a/imago_pack/intrsc.py b/imago_pack/intrsc.py
index 45308b1..c64386f 100644
--- a/imago_pack/intrsc.py
+++ b/imago_pack/intrsc.py
@@ -5,6 +5,7 @@ from operator import itemgetter
 
 import ImageDraw
 
+import filters
 import k_means
 import output
 
@@ -36,10 +37,14 @@ def board(image, lines, show_all, do_something):
                 draw.point((x , y), fill=(120, 255, 120))
         do_something(image_g, "intersections")
 
+    image_c = filters.color_enhance(image)
+    if show_all:
+        do_something(image_c, "white balance")
+    
     board_raw = []
     
     for line in intersections:
-        board_raw.append([stone_color_raw(image, intersection) for intersection in
+        board_raw.append([stone_color_raw(image_c, intersection) for intersection in
                       line])
     board_raw = sum(board_raw, [])
 
-- 
2.4.2