images.Gamma
Syntax
images.Gamma GAMMA
Returns
images.filter
伽玛值必须为正数。大于1的值会使图像变亮,而小于1的值会使图像变暗。当伽玛值为1时,滤镜没有效果。
用法
创建滤镜:
{{ $filter := images.Gamma 1.667 }}
使用images.Filter
函数应用过滤器:
{{ with resources.Get "images/original.jpg" }}
{{ with . | images.Filter $filter }}
<img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
{{ end }}
{{ end }}
您还可以使用Resource
对象上的Filter
方法应用过滤器:
{{ with resources.Get "images/original.jpg" }}
{{ with .Filter $filter }}
<img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
{{ end }}
{{ end }}
示例
Original
![Zion National Park](/images/examples/zion-national-park_hu2473d238508875bc4df5e5b4b4416164_44553_384x0_resize_q75_catmullrom.jpg)
Processed
![Zion National Park](/images/examples/zion-national-park_hu2473d238508875bc4df5e5b4b4416164_44553_071670f5ffdd2e975a3e79057f965ce8.jpg)