images.UnsharpMask
Returns an image filter that sharpens an image.
Syntax
images.UnsharpMask SIGMA AMOUNT THRESHOLD
Returns
images.filter
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:
{{ $filter := images.UnsharpMask 10 0.4 0.03 }}使用 images.Filter 函数应用滤镜：
{{ with resources.Get "images/original.jpg" }}
{{ with . | images.Filter $filter }}
<img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
{{ end }}
{{ end }}您也可以使用 Resource 对象上的 Filter 方法应用滤镜：
{{ with resources.Get "images/original.jpg" }}
{{ with .Filter $filter }}
<img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
{{ end }}
{{ end }}
{{__hugo_ctx/}}
## Example
Original
Processed
