[ww-6]

• imresize documents scale_factor as output / input (scale_factor=0.5 halves the image), and the default interpolation="optimize" uses cv2.INTER_AREA below 1.0 and cv2.INTER_CUBIC otherwise.
• When only output_size was passed, the scale factor was derived as input / output, so every downscale was treated as an upscale and got bicubic interpolation.
  • e.g. a 448 px image with output_size=(224, 224) used INTER_CUBIC, while scale_factor=0.5 on the same image used INTER_AREA.
• Fix: derive the scale factor as output / input.
• Add test_imresize_output_size_interpolation, which checks that output_size and the equivalent scale_factor select the same interpolation for both a downscale and an upscale. The test fails without the fix.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c0bbb14) to head (57b9de5).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #1173      +/-   ##
============================================
+ Coverage    99.91%   100.00%   +0.08%     
============================================
  Files          112        15      -97     
  Lines        13454      1243   -12211     
  Branches      1610         0    -1610     
============================================
- Hits         13443      1243   -12200     
+ Misses           5         0       -5     
+ Partials         6         0       -6     

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