how fast is it compared to opencv resize ?

[rom1504]

Would be useful to add that to the benchmark

[rom1504]

also compared to pillow simd https://python-pillow.org/pillow-perf/

[sebasi]

Until this gets to the benchmark I did some simple benchmarks myself.
Perhaps this helps someone...

jpegtran was the fastest in all situations, but unfortunately also presents the worst image quality due to be limited to the NEAREST algorithm (similar to pillow-nearest).
A real boost was to use pillow-simd. For my usecase (downscaling images) performance is about 3x better than default pillow.

Method	Resampling filter	performance
jpegtran		110
pillow-simd	NEAREST	96
pillow-simd	BOX	77
pillow-simd	BILINEAR	71
pillow-simd	HAMMING	70
pillow-simd	BICUBIC	64
cv2		53
pillow	NEAREST	33
pillow	BOX	26
pillow	BILINEAR	24
pillow	HAMMING	23
pillow	BICUBIC	19
pillow	LANCZOS	17

Versions used: Pillow-7.2.0, Pillow_SIMD-7.0.0.post3, jpegtran-cffi 0.5.2, opencv-python 4.4.0.46

Values indicate the avg amount of images processed per second (on a single core VM) - so just take the value for basic comparison.

[cbm755]

Thanks @rom1504 and @sebasi

@sebasi What is the benchmark problem? (I assume downscaling, but is it same problem mentioned in the readme?)

The README file mentioned: "Benchmark source: https://gist.github.com/jbaiter/8596064". If either of you feel like modifying that script to include pillow-simd (to start with), I'd be happy to help get that merged.

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Caveat: I'm a co-maintainer of this but haven't had a chance to do much with it!