images.Sigmoid
Returns an image filter that changes the contrast of an image using a sigmoidal function.
Syntax
images.Sigmoid MIDPOINT FACTOR
Returns
images.filter
This is a non-linear contrast change useful for photo adjustments; it preserves highlight and shadow detail.
The midpoint is the midpoint of contrast. It must be in the range [0, 1], typically 0.5.
The factor indicates how much to increase or decrease the contrast, typically in the range [-10, 10] where 0 has no effect. A positive value increases contrast, while a negative value decrease contrast.
Usage
Create the filter:
{{ $filter := images.Sigmoid 0.6 -4 }}使用 images.Filter 函數應用濾鏡：
{{ 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 對象上的 Filter 方法應用濾鏡：
{{ with resources.Get "images/original.jpg" }}
{{ with .Filter $filter }}
<img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
{{ end }}
{{ end }}
{{__hugo_ctx/}}
## Example
Original
Processed
