PIL/Pillow

pip install pillow

python
from PIL import Image

img = Image.open("input.tif")
img_array = np.array(img)

https://pillow.readthedocs.io/en/stable/reference/Image.html
https://stackoverflow.com/questions/56174099/how-to-load-images-larger-than-max-image-pixels-with-pil

## PIL.Image.DecompressionBombError: Image size (400000000 pixels) exceeds limit of 178956970 pixels, could be decompression bomb DOS attack.
Image.MAX_IMAGE_PIXELS = None

## Traceback (most recent call last):
##   File "<stdin>", line 1, in <module>
##   File "PIL/Image.py", line 3280, in open
##     raise UnidentifiedImageError(msg)
## PIL.UnidentifiedImageError: cannot identify image file 'input.tif'

• Check if the input image is not corrupted at first
• Consider using Tifffile if the format is unsupported by PIL/Pillow (e.g., 32-bit TIFF with alpha channel)

https://pillow.readthedocs.io/en/stable/handbook/concepts.html

img.mode

img = Image.open("input.tif")

img.mode
## LA, PA, or RGBA

img_alpha = img.getchannel("A")
img_alpha_array = np.array(img_alpha)

## Binarization (as needed)
img_alpha_array = np.where(img_alpha_array == 0, 1, 0).astype(np.uint8)
#img_alpha_array = np.where(img_alpha_array == 0, 255, 0).astype(np.uint8)

img_out = Image.fromarray(img_alpha_array, mode="L")
img_out.save("output.tif")

Pillow
https://pypi.org/project/pillow/
https://pillow.readthedocs.io/

https://qiita.com/pashango2/items/145d858eff3c505c100a

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