mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-14 20:37:55 -05:00
40 lines
1 KiB
Markdown
40 lines
1 KiB
Markdown
---
|
|
title: images.UnsharpMask
|
|
description: Returns an image filter that sharpens an image.
|
|
categories: []
|
|
keywords: []
|
|
action:
|
|
aliases: []
|
|
related:
|
|
- functions/images/Filter
|
|
- methods/resource/Filter
|
|
returnType: images.filter
|
|
signatures: [images.UnsharpMask SIGMA AMOUNT THRESHOLD]
|
|
toc: true
|
|
---
|
|
|
|
The sigma argument is used in a gaussian function and affects the radius of effect. Sigma must be positive. The sharpen radius is approximately 3 times the sigma value.
|
|
|
|
The amount argument controls how much darker and how much lighter the edge borders become. Typically between 0.5 and 1.5.
|
|
|
|
The threshold argument controls the minimum brightness change that will be sharpened. Typically between 0 and 0.05.
|
|
|
|
## Usage
|
|
|
|
Create the filter:
|
|
|
|
```go-html-template
|
|
{{ $filter := images.UnsharpMask 10 0.4 0.03 }}
|
|
```
|
|
|
|
{{% include "functions/images/_common/apply-image-filter.md" %}}
|
|
|
|
## Example
|
|
|
|
{{< img
|
|
src="images/examples/zion-national-park.jpg"
|
|
alt="Zion National Park"
|
|
filter="UnsharpMask"
|
|
filterArgs="10,0.4,0.03"
|
|
example=true
|
|
>}}
|