Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

1 files changed, 36 insertions, 0 deletions

diff --git a/docs/content/en/functions/images/Gamma.md b/docs/content/en/functions/images/Gamma.md
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+---
+title: images.Gamma
+description: Returns an image filter that performs gamma correction on an image.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/images/Filter
+    - methods/resource/Filter
+  returnType: images.filter
+  signatures: [images.Gamma GAMMA]
+toc: true
+---
+
+The gamma value must be positive. A value greater than 1 lightens the image, while a value less than 1 darkens the image. The filter has no effect when the gamma value is 1.
+
+## Usage
+
+Create the filter:
+
+```go-html-template
+{{ $filter := images.Gamma 1.667 }}
+```
+
+{{% include "functions/images/_common/apply-image-filter.md" %}}
+
+## Example
+
+{{< img
+  src="images/examples/zion-national-park.jpg"
+  alt="Zion National Park"
+  filter="Gamma"
+  filterArgs="1.667"
+  example=true
+>}}