回答編集履歴
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test
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img_clolr ⇒ img_color では？
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---
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あと範囲指定が変です。`img[100:100, 400:400, :]`だと大きさ0の画像になってませんか。
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```Python
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>>> import numpy as np
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>>>
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>>> img = np.arange(10)
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>>> img
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array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
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>>>
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>>> img[1:5]
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array([1, 2, 3, 4])
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>>> img[1:1]
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array([], dtype=int32)
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```
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