From cd9a260bac551b10be7d89828b283603a698e21b Mon Sep 17 00:00:00 2001
From: odebeir <odebeir@ulb.ac.be>
Date: Fri, 28 Aug 2015 22:13:40 +0200
Subject: [PATCH 1/4] add gamma correction example

---
 doc/examples/plot_log_gamma.py | 77 ++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 doc/examples/plot_log_gamma.py

diff --git a/doc/examples/plot_log_gamma.py b/doc/examples/plot_log_gamma.py
new file mode 100644
index 00000000..03975b7f
--- /dev/null
+++ b/doc/examples/plot_log_gamma.py
@@ -0,0 +1,77 @@
+"""
+======================================
+Gamma and log contrast adjustment
+======================================
+
+This examples adjust image contrast by performing a Gamma and a Logarithmic
+correction on the input image.
+
+"""
+import matplotlib
+import matplotlib.pyplot as plt
+import numpy as np
+
+from skimage import data, img_as_float
+from skimage import exposure
+
+matplotlib.rcParams['font.size'] = 8
+
+
+def plot_img_and_hist(img, axes, bins=256):
+    """Plot an image along with its histogram and cumulative histogram.
+
+    """
+    img = img_as_float(img)
+    ax_img, ax_hist = axes
+    ax_cdf = ax_hist.twinx()
+
+    # Display image
+    ax_img.imshow(img, cmap=plt.cm.gray)
+    ax_img.set_axis_off()
+
+    # Display histogram
+    ax_hist.hist(img.ravel(), bins=bins, histtype='step', color='black')
+    ax_hist.ticklabel_format(axis='y', style='scientific', scilimits=(0, 0))
+    ax_hist.set_xlabel('Pixel intensity')
+    ax_hist.set_xlim(0, 1)
+    ax_hist.set_yticks([])
+
+    # Display cumulative distribution
+    img_cdf, bins = exposure.cumulative_distribution(img, bins)
+    ax_cdf.plot(bins, img_cdf, 'r')
+    ax_cdf.set_yticks([])
+
+    return ax_img, ax_hist, ax_cdf
+
+
+# Load an example image
+img = data.moon()
+
+# Gamma
+gamma_corrected = exposure.adjust_gamma(img, 2)
+
+# Logarithmic
+logarithmic_corrected = exposure.adjust_log(img, 1)
+
+# Display results
+fig, axes = plt.subplots(nrows=2, ncols=3, figsize=(8, 5))
+
+ax_img, ax_hist, ax_cdf = plot_img_and_hist(img, axes[:, 0])
+ax_img.set_title('Low contrast image')
+
+y_min, y_max = ax_hist.get_ylim()
+ax_hist.set_ylabel('Number of pixels')
+ax_hist.set_yticks(np.linspace(0, y_max, 5))
+
+ax_img, ax_hist, ax_cdf = plot_img_and_hist(gamma_corrected, axes[:, 1])
+ax_img.set_title('Gamma correction')
+
+ax_img, ax_hist, ax_cdf = plot_img_and_hist(logarithmic_corrected, axes[:, 2])
+ax_img.set_title('Logarithmic correction')
+
+ax_cdf.set_ylabel('Fraction of total intensity')
+ax_cdf.set_yticks(np.linspace(0, 1, 5))
+
+# prevent overlap of y-axis labels
+fig.subplots_adjust(wspace=0.4)
+plt.show()
\ No newline at end of file

From 014ba261fbebb88bbaf187d8b876e08ab43c8e2a Mon Sep 17 00:00:00 2001
From: odebeir <odebeir@ulb.ac.be>
Date: Fri, 28 Aug 2015 22:17:25 +0200
Subject: [PATCH 2/4] add gamma correction example

---
 doc/examples/plot_log_gamma.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/examples/plot_log_gamma.py b/doc/examples/plot_log_gamma.py
index 03975b7f..d2d60149 100644
--- a/doc/examples/plot_log_gamma.py
+++ b/doc/examples/plot_log_gamma.py
@@ -3,8 +3,8 @@
 Gamma and log contrast adjustment
 ======================================
 
-This examples adjust image contrast by performing a Gamma and a Logarithmic
-correction on the input image.
+This example adjusts image contrast by performing a Gamma and a Logarithmic
+corrections on the input image.
 
 """
 import matplotlib

From 7046df9d3c74806a750f1f836f5308c810246119 Mon Sep 17 00:00:00 2001
From: odebeir <odebeir@ulb.ac.be>
Date: Thu, 3 Sep 2015 20:25:57 +0200
Subject: [PATCH 3/4] typos

---
 doc/examples/plot_log_gamma.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/doc/examples/plot_log_gamma.py b/doc/examples/plot_log_gamma.py
index d2d60149..fd0a6767 100644
--- a/doc/examples/plot_log_gamma.py
+++ b/doc/examples/plot_log_gamma.py
@@ -1,7 +1,7 @@
 """
-======================================
+=================================
 Gamma and log contrast adjustment
-======================================
+=================================
 
 This example adjusts image contrast by performing a Gamma and a Logarithmic
 corrections on the input image.
@@ -74,4 +74,4 @@ ax_cdf.set_yticks(np.linspace(0, 1, 5))
 
 # prevent overlap of y-axis labels
 fig.subplots_adjust(wspace=0.4)
-plt.show()
\ No newline at end of file
+plt.show()

From c9cc47a635d92dc5923e6bc382a7712e94185645 Mon Sep 17 00:00:00 2001
From: Olivier Debeir <odebeir@ulb.ac.be>
Date: Fri, 4 Sep 2015 17:19:53 +0200
Subject: [PATCH 4/4] typo

---
 doc/examples/plot_log_gamma.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/examples/plot_log_gamma.py b/doc/examples/plot_log_gamma.py
index fd0a6767..04a1edbb 100644
--- a/doc/examples/plot_log_gamma.py
+++ b/doc/examples/plot_log_gamma.py
@@ -4,7 +4,7 @@ Gamma and log contrast adjustment
 =================================
 
 This example adjusts image contrast by performing a Gamma and a Logarithmic
-corrections on the input image.
+correction on the input image.
 
 """
 import matplotlib