https://github.com/kleisauke/resize-comparison

Analyzing the image scaling algorithms implemented in other libraries.
https://github.com/kleisauke/resize-comparison

Last synced: 8 days ago
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Analyzing the image scaling algorithms implemented in other libraries.

• Host: GitHub
• URL: https://github.com/kleisauke/resize-comparison
• Owner: kleisauke
• Created: 2020-08-06T11:11:41.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2024-12-16T15:07:26.000Z (9 days ago)
• Last Synced: 2024-12-16T16:24:44.536Z (9 days ago)
• Language: Python
• Homepage:
• Size: 17.2 MB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# resize-comparison

Analyzing the image scaling algorithms implemented in other libraries.

## Run

```bash

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

# ResampleScope

./resamplescope.sh

```

See [output/](output) directory.

## Output radial.rgb.png

**Notes**

- The 8x versions are used for comparison.

### Pillow reduce() vs libvips shrink()

| Pillow | libvips |

| :---: | :---: |

| ![8x_pillow_reduce.png](output/8x_pillow_reduce.png) | ![8x_vips_shrink.png](output/8x_vips_shrink.png) |

| | Identical to Pillow |

### Pillow resize() vs libvips reduce()

| Pillow | libvips |

| :---: | :---: |

| ![8x_pillow_resize.png](output/8x_pillow_resize.png) | ![8x_vips_reduce.png](output/8x_vips_reduce.png) |

| | Almost identical to Pillow¹ |

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

| Pillow | libvips |

| :---: | :---: |

| ![8x_pillow_resize_gap.png](output/8x_pillow_resize_gap.png) | ![8x_vips_resize.png](output/8x_vips_resize.png) |

| | 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 |

| :---: | :---: |

| ![pd_magick_box-out.png](output/pd_magick_box-out.png) | ![pd_vips_nearest-out.png](output/pd_vips_nearest-out.png) |

| | Identical to ImageMagick |

### ImageMagick triangle vs libvips linear

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_triangle-out.png](output/pd_magick_triangle-out.png) | ![pd_vips_linear-out.png](output/pd_vips_linear-out.png) |

| | Identical to ImageMagick |

### ImageMagick catrom vs libvips cubic

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_catrom-out.png](output/pd_magick_catrom-out.png) | ![pd_vips_cubic-out.png](output/pd_vips_cubic-out.png) |

| | Identical to ImageMagick |

### ImageMagick mitchell vs libvips mitchell

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_mitchell-out.png](output/pd_magick_mitchell-out.png) | ![pd_vips_mitchell-out.png](output/pd_vips_mitchell-out.png) |

| | Identical to ImageMagick |

### ImageMagick lanczos2 vs libvips lanczos2

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_lanczos2-out.png](output/pd_magick_lanczos2-out.png) | ![pd_vips_lanczos2-out.png](output/pd_vips_lanczos2-out.png) |

| | Identical to ImageMagick |

### ImageMagick lanczos vs libvips lanczos3

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_lanczos-out.png](output/pd_magick_lanczos-out.png) | ![pd_vips_lanczos3-out.png](output/pd_vips_lanczos3-out.png) |

| | Identical to ImageMagick |

### ImageMagick magickernelsharp2013 vs libvips mks2013

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_magickernelsharp2013-out.png](output/pd_magick_magickernelsharp2013-out.png) | ![pd_vips_mks2013-out.png](output/pd_vips_mks2013-out.png) |

| | Identical to ImageMagick |

### ImageMagick magickernelsharp2021 vs libvips mks2021

| ImageMagick | libvips |

| :---: | :---: |

| ![pd_magick_magickernelsharp2021-out.png](output/pd_magick_magickernelsharp2021-out.png) | ![pd_vips_mks2021-out.png](output/pd_vips_mks2021-out.png) |

| | Identical to ImageMagick |