回答編集履歴
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プログラムを追記
test
CHANGED
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@@ -27,3 +27,61 @@
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```
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としてみてはどうでしょうか？
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---
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以下追記
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当方の環境 (Windows10/Python 3.8.10) で数カ所の修正で正常動作を確認しました。
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```Python
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import cv2
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import numpy as np
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from matplotlib import pyplot as plt
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def main():
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img = cv2.imread(r"C:\2020-03\IMG_2052.JPG")
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gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
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hist, bins = np.histogram(gray.ravel(),256,[0,256])
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print(hist)
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plt.xlim(0,255)
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plt.plot(hist)
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plt.xlabel("pixel value", fontsize=20)
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plt.ylabel("Number of pixels", fontsize=20)
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plt.grid()
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plt.show()
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if __name__ == "__main__":
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main()
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```
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