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Add Magic Kernel Sharp (no relation) to resizing kernels

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Lovell Fuller
2025-06-15 12:53:10 +01:00
parent 8669fbc936
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docs/src/content/docs/api-resize.md
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@@ -38,6 +38,8 @@ Possible downsizing kernels are:
- `mitchell`: Use a [Mitchell-Netravali spline](https://www.cs.utexas.edu/~fussell/courses/cs384g-fall2013/lectures/mitchell/Mitchell.pdf).
- `lanczos2`: Use a [Lanczos kernel](https://en.wikipedia.org/wiki/Lanczos_resampling#Lanczos_kernel) with `a=2`.
- `lanczos3`: Use a Lanczos kernel with `a=3` (the default).
- `mks2013`: Use a [Magic Kernel Sharp](https://johncostella.com/magic/mks.pdf) 2013 kernel, as adopted by Facebook.
- `mks2021`: Use a Magic Kernel Sharp 2021 kernel, with more accurate (reduced) sharpening than the 2013 version.
When upsampling, these kernels map to `nearest`, `linear` and `cubic` interpolators.
Downsampling kernels without a matching upsampling interpolator map to `cubic`.

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docs/src/content/docs/changelog.md
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@@ -10,6 +10,8 @@ Requires libvips v8.17.0
* Upgrade to libvips v8.17.0 for upstream bug fixes.
* Add "Magic Kernel Sharp" (no relation) to resizing kernels.
* Expose JPEG 2000 `oneshot` decoder option.
[#4262](https://github.com/lovell/sharp/pull/4262)
[@mbklein](https://github.com/mbklein)