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Break existing sharpen API to accept sigma and improve precision

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Lovell Fuller
2016-03-31 22:00:33 +01:00
parent ee21d2991c
commit b7a098fb28
8 changed files with 55 additions and 48 deletions
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docs/api.md
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@@ -374,15 +374,15 @@ When used without parameters, performs a fast, mild blur of the output image. Th
When a `sigma` is provided, performs a slower, more accurate Gaussian blur. This typically reduces performance by 25%.
* `sigma`, if present, is a Number between 0.3 and 1000 representing the approximate blur radius in pixels.
* `sigma`, if present, is a Number between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
#### sharpen([radius], [flat], [jagged])
#### sharpen([sigma], [flat], [jagged])
When used without parameters, performs a fast, mild sharpen of the output image. This typically reduces performance by 10%.
When a `radius` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space. Separate control over the level of sharpening in "flat" and "jagged" areas is available. This typically reduces performance by 50%.
When a `sigma` is provided, performs a slower, more accurate sharpen of the L channel in the LAB colour space. Separate control over the level of sharpening in "flat" and "jagged" areas is available. This typically reduces performance by 50%.
* `radius`, if present, is an integral Number representing the sharpen mask radius in pixels.
* `sigma`, if present, is a Number representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
* `flat`, if present, is a Number representing the level of sharpening to apply to "flat" areas, defaulting to a value of 1.0.
* `jagged`, if present, is a Number representing the level of sharpening to apply to "jagged" areas, defaulting to a value of 2.0.

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docs/changelog.md
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@@ -4,6 +4,7 @@
* Take advantage of libvips 8.3 features.
Use shrink-on-load for WebP input.
Break existing sharpen API to accept sigma and improve precision.
[#369](https://github.com/lovell/sharp/issues/369)
### v0.14 - "*needle*"