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Document new cutout option of overlayWith feature #435

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Lovell Fuller 2016-06-26 13:53:20 +01:00
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docs/api.md
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@ -432,6 +432,7 @@ Overlay (composite) a image containing an alpha channel over the processed (resi
* `gravity` is a String or an attribute of the `sharp.gravity` Object e.g. `sharp.gravity.north` at which to place the overlay, defaulting to `center`/`centre`.
* `tile` is a Boolean, defaulting to `false`. When set to `true` repeats the overlay image across the entire image with the given `gravity`.
* `cutout` is a Boolean, defaulting to `false`. When set to `true` applies only the alpha channel of the overlay image to the image to be overlaid, giving the appearance of one image being cut out of another.
```javascript
sharp('input.png')

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docs/changelog.md
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@ -18,6 +18,10 @@ Requires libvips v8.3.1
[#443](https://github.com/lovell/sharp/pull/443)
[@lemnisk8](https://github.com/lemnisk8)
* Add cutout option to overlayWith feature, applies only the alpha channel of the overlay image.
[#448](https://github.com/lovell/sharp/pull/448)
[@kleisauke](https://github.com/kleisauke)
* Ensure scaling factors are calculated independently to prevent rounding errors.
[#452](https://github.com/lovell/sharp/issues/452)
[@puzrin](https://github.com/puzrin)