Merge commit '35dec7c96f7ee3eb17dd444f7067f0c776fb56ae'

docs/content/en/functions/images/Contrast.md

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+---
+title: images.Contrast
+description: Returns an image filter that changes the contrast of an image.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/images/Filter
+    - methods/resource/Filter
+  returnType: images.filter
+  signatures: [images.Contrast PERCENTAGE]
+toc: true
+---
+
+The percentage must be in the range [-100, 100] where 0 has no effect. A value of `-100` produces a solid grey image, and a value of `100` produces an over-contrasted image.
+
+## Usage
+
+Create the filter:
+
+```go-html-template
+{{ $filter := images.Contrast -20 }}
+```
+
+{{% include "functions/images/_common/apply-image-filter.md" %}}
+
+## Example
+
+{{< img
+  src="images/examples/zion-national-park.jpg"
+  alt="Zion National Park"
+  filter="Contrast"
+  filterArgs="-20"
+  example=true
+>}}