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I'm trying to crop an image before applying CNN. I do not understand the above method of cropping. I understand that it is attempting to crop the image but do not understand the negative value.

Mehul Sharma
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    Does this answer your question? [How does slice indexing work in numpy array](https://stackoverflow.com/questions/55581540/how-does-slice-indexing-work-in-numpy-array) – Tomerikoo Feb 04 '21 at 15:15
  • Also helpful [Understanding slice notation](https://stackoverflow.com/questions/509211/understanding-slice-notation) – Tomerikoo Feb 04 '21 at 15:17

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This looks like NumPy advanced indexing, where you specify the indices for each axis, separated by commas. As for the negative, when indexing in Python a negative number indicates the index starts from the end and not the beginning. So, 60:-25 means starting from index 60 and ending 25 indices from the end.

Andy
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