Pillow cannot read from array gray image? · Issue #3781 · python-pillow/Pillow · GitHub
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![1. Basic Image Handling and Processing - Programming Computer Vision with Python [Book]](https://www.oreilly.com/api/v2/epubs/9781449341916/files/httpatomoreillycomsourceoreillyimages1239568.png.jpg "1. Basic Image Handling and Processing - Programming Computer Vision with Python [Book]")
1. Basic Image Handling and Processing - Programming Computer Vision with Python [Book]
Grayscale PNG image incorrectly converted to RGB · Issue #2574 · python-pillow/Pillow · GitHub
How to Convert an RGB Image to Grayscale
