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Convert_Color_Image_to_Pencil_Sketch/Convert_Color_Image_to_Sketch.py

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+# -*- coding: utf-8 -*-
+"""Convert_Color_Image_to_Sketch.ipynb
+
+Automatically generated by Colaboratory.
+
+Original file is located at
+    https://colab.research.google.com/drive/1vcd0PcYBJ-RtS_iYr262c4yVfofzkuAY
+"""
+
+#Install imageio package
+!pip install imageio
+
+# Commented out IPython magic to ensure Python compatibility.
+# %matplotlib inline
+import imageio
+import requests
+import matplotlib.pyplot as plt
+import IPython.display as dp
+
+#Display the image from the web using an URI.
+img="https://www.lovethisimages.com/wp-content/uploads/2018/04/sorry-images-download-1.jpg"
+dp.Image(requests.get(img).content)
+
+#Read the image using imgaeio package's imread method and URI from web using 
+source_img = imageio.imread(img)
+
+# Make the image Black and White using the formula Y= 0.299*R + 0.587*G + 0.114*B i.e. applying greyscale
+import numpy as np
+
+def grayscaleimg(rgb): 
+  return np.dot(rgb[...,:3], [0.299, 0.587, 0.114])
+
+gryscl_img = grayscaleimg(source_img)
+
+#Invert the image by subtracting it from 255
+inv_img = (255 - gryscl_img)
+plt.imshow(inv_img)
+
+#Blur the image using gaussian filter
+import scipy.ndimage
+blurred_img = scipy.ndimage.filters.gaussian_filter(inv_img, sigma=5)
+plt.imshow(blurred_img)
+
+#Create function to perform dogding(belnding together greyscale and blurred image)
+def dodging(blur_img, gryscl_img):
+    resultant_dodge=blur_img*255/(255-gryscl_img) 
+    resultant_dodge[resultant_dodge>255]=255
+    resultant_dodge[gryscl_img==255]=255
+    return resultant_dodge.astype('uint8')
+
+#Generate the target image by applying the dodge
+target_img= dodging(blurred_img, gryscl_img)
+
+# Commented out IPython magic to ensure Python compatibility.
+#Display the target image
+# %matplotlib inline
+import matplotlib.pyplot as plt
+plt.imshow(target_img, cmap="gray")
+
+#Save the image
+plt.imsave('target_image.png', target_img, cmap='gray', vmin=0, vmax=255)
+