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Add named 'alpha' channel to extractChannel op #2138

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Lovell Fuller
2020-06-07 10:43:27 +01:00
parent 7f142bddb3
commit 17ea70a102
6 changed files with 28 additions and 11 deletions
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docs/api-channel.md
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@@ -42,7 +42,7 @@ Extract a single channel from a multi-channel image.
### Parameters
- `channel` **([number][1] \| [string][2])** zero-indexed band number to extract, or `red`, `green` or `blue` as alternative to `0`, `1` or `2` respectively.
- `channel` **([number][1] \| [string][2])** zero-indexed channel/band number to extract, or `red`, `green`, `blue` or `alpha`.
### Examples

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docs/changelog.md
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@@ -18,6 +18,9 @@ Requires libvips v8.9.1
Expose `levels` metadata for multi-level images.
[#2222](https://github.com/lovell/sharp/issues/2222)
* Add support for named `alpha` channel to `extractChannel` operation.
[#2138](https://github.com/lovell/sharp/issues/2138)
### v0.25.3 - 17th May 2020
* Ensure libvips is initialised only once, improves worker thread safety.