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## 補足
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チャンネルの分割は `cv2.split` を使ったほうがわかりやすいコードになると思います。
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[画像上の基本的な処理 — OpenCV-Python Tutorials 1 documentation](http://labs.eecs.tottori-u.ac.jp/sd/Member/oyamada/OpenCV/html/py_tutorials/py_core/py_basic_ops/py_basic_ops.html#id5)
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```python
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import cv2
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import numpy as np
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a = np.array(
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[
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[[0, 1, 2],
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[0, 1, 2],
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[0, 1, 2]],
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[[0, 1, 2],
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[0, 1, 2],
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[0, 1, 2]],
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[[0, 1, 2],
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[0, 1, 2],
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[0, 1, 2]],
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]
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)
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h, s, v = cv2.split(a)
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```
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----
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