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Pythonコードを追加
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```
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```Python
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# -*- coding: utf-8 -*-
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"""Tone-curve-Postarization.ipynb
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Automatically generated by Colaboratory.
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Original file is located at
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https://colab.research.google.com/drive/1jU2JgQ2kJhRBwaTt3S6VyRILmUFueHIc
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"""
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!wget http://www.centerportgardenclub.org/wp-content/gallery/photos/2014-marisa-comple-IMG_5867.jpeg img.jpg
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mv 2014-marisa-comple-IMG_5867.jpeg img.jpg
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ls
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# %matplotlib inline
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import cv2
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import matplotlib.pyplot as plt
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src_img = cv2.imread("img.jpg", 0);
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plt.imshow( src_img)
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max_ = 256
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step_ = 4
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lut = [0] * max_
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for i in range(max_):
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lut[i] = (i / (max_ / step_)) * (max_ / step_)
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dst_img = []
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for i in range(480):
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temp = []
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for j in range(480):
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temp.append(0)
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dst_img.append(temp)
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dst_img[1][5]
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for y in range(src_img.shape[0]):
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for x in range(src_img.shape[1]):
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dst_img[y][x] = lut[src_img[y][x]];
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dst_img[170][239]
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src_img.shape
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plt.imshow(dst_img)
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```
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