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Resize not allowing filter parameter on 16 bit image #8333

@Zaaaane

Description

@Zaaaane

When attempting to resize a 16 bit image as shown below, a value error appears and crashes the program: "ValueError: image has wrong mode" The image type is "I;16"

The primary problem is that this worked without error in early July and hasn't been touched in a month. When I opened the code today it gave the error even when reverting to a previously stable version. Below is the relevant code inside a custom cropping method. The coord_tup variable is just a tuple that is working as expected

 new_im = im.crop(coord_tup)
 newSize = (640, 480)
 new_im = new_im.resize(newSize, resample=Image.Resampling.LANCZOS)
 npImg = np.asarray(new_im)
 return npImg

As stated this code used to work fine but when opened this week I get a value error on the line with the resize method, though it will technically work if I change the following

 new_im = new_im.resize(newSize, resample=Image.Resampling.LANCZOS)

->

 new_im = new_im.resize(newSize)

I understand through the API documentation that this should default to NEAREST but I could not find anything stating that LANCZOS would not work with 16 bit imaging

  • OS: macOS Sonoma 14.6.1 (23G93
  • Python: 3.12.3
  • Pillow: 10.4.0

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