jekyll-image_optimizer
A jekyll plugin to optimize images for the web. It reads all the images in a source directory and saves optimized versions of them to a destination directory and creates a symbolic link to the destination directory.
Install it with gem install jekyll-image_optimizer.
Add this to your plugins/ext.rb file: require 'jekyll/image_optimizer'.
The following options for _config.yml are available:
| Option | Description | Default value |
|---|---|---|
raw_images |
the directory containing the unoptimized images | img/raw |
opt_images |
the directory containing the optimized images | img/opt |
images_link |
the name of the symbolic link pointing to opt_images
|
images |
image_geometry |
the size all images should be, is an ImageMagick geometry string and may be an array | 800x800> |
image_hash |
if the optimized image files should be appended with a hash to enable unlimited caching | true |
image_layout |
the file containing the template for the image tag (inside _layouts folder) |
image.html |
The plugin defines two liquid tags: srcset and image.
To include an image with multiple resolutions (using scrset) into a post, do the following:
In _layouts/image.html define the template of an image. For example:
<img srcset="{% srcset {{image.index}} %}" alt="{{image.alt}}"/>
In the front matter of the post, add
image:
- url: my_image.jpg
alt: My Alt
layout: my-image.html
and reference the image using {% image 0 %} where 0 is the index of the image.
The optional layout parameter overwrites the image_layout parameter in _config.yml.