Merge pull request #116 from muratonuryildirim/master

Issue No: 82 RGB to Grayscale

scripts/rgb_to_grayscale/readme.md

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+# RGB to Grayscale Images
+
+This simple script converts RGB .png files to Grayscale .png files.
+
+## Usage
+
+Dependency:
+- numpy
+- matplotlib
+- Use `pip install numpy and python` and `-m pip install -U matplotlib`

scripts/rgb_to_grayscale/script.py

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+
+ import numpy as np
+ import matplotlib.pyplot as plt
+ import matplotlib.image as mpimg
+
+ def rgb2gray(png_file='file_example.png'):
+     img = mpimg.imread(png_file)
+     gray = np.dot(img[:,:,:3], [0.2989, 0.5870, 0.1140])
+     plt.imshow(gray, cmap=plt.get_cmap('gray'), vmin=0, vmax=1)
+     plt.axis('off')
+     plt.savefig('gray_' + png_file + '.png', dpi=300)