resize-comparison

Analyzing the image scaling algorithms implemented in other libraries.

Run

python3 test-resize.py input/radial.rgb.png

# ResampleScope
./resamplescope.sh

See output/ directory.

Output radial.rgb.png

Notes

• The 8x versions are used for comparison.

Pillow reduce() vs libvips shrink()

Pillow	libvips
	Identical to Pillow

Pillow resize() vs libvips reduce()

Pillow	libvips
	Almost identical to Pillow¹

Pillow resize(reducing_gap=2.0) vs libvips resize()

Pillow	libvips
	Almost identical to Pillow¹

Footnotes

¹ Pillow is considering pixels outside the image as not exist, while libvips is expanding the edge pixels outside the image. These different ways of edge handling are probably fine.

Output ResampleScope

ImageMagick box vs libvips nearest

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick triangle vs libvips linear

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick catrom vs libvips cubic

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick mitchell vs libvips mitchell

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick lanczos2 vs libvips lanczos2

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick lanczos vs libvips lanczos3

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick magickernelsharp2013 vs libvips mks2013

ImageMagick	libvips
	Identical to ImageMagick

ImageMagick magickernelsharp2021 vs libvips mks2021

ImageMagick	libvips
	Identical to ImageMagick