System information (version)

• OpenCV => 4.5.4
• Language=> python/cpp
• Operating System / Platform => Windows
• Compiler => MSVC 19.32.31332.0
  I am trying to replicate PIL and scikit-image nearest-neighbor o/p in OpenCV but getting INTER_NEAREST o/p.

• Original image:
  img
  

• OpenCV INTER_NEAREST:
  

 cv2.resize(x,(0,0),fx=0.5,fy=0.5,interpolation=cv2.INTER_NEAREST)

• OpenCV INTER_NEAREST_EXACT:
  

 cv2.resize(x,(0,0),fx=0.5,fy=0.5,interpolation=cv2.INTER_NEAREST)

• PIL :
  

x1=Image.fromarray(img)
x1.thumbnail((256,256),Image.Resampling.NEAREST) 

• scikit-image :
  

rescale(x,0.5,order=0,preserve_range=True, anti_aliasing=False) 

As it can be seen, OpenCV INTER_NEAREST and OpenCV INTER_NEAREST_EXACT are matching, which is not expected.

The expected was that the OpenCV INTER_NEAREST_EXACT should match PIL and scikit-image o/p, but I am getting this difference:

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc