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Informations about the package imagecache
Imagecache
Automatically generate images at the size you need them with presets
Works with any framework
How it works
Provided your images folder is images, your cache folder is cache and you have a preset called 200x200
When you call the url /images/cache/200x200/image.jpg and the file doesn't exist it will automatically take the file images/image.jpg, apply the preset to it, return it to the client and save it at the request's path to serve it from the webserver the next time.
Here is the folder structure:
An url to a cached image is built as follows :
/<image folder>/<cache folder>/<preset name>/<file name>
Image files can be in sub-folders, for example images/avatars/me.jpg will have this url with a 40x40 preset : images/cache/40x40/avatars/me.jpg
Prerequisites
For it to work you need
- PHP 5.5
- Clean urls with apache url_rewrite or nginx rewrites
Installation
Preset configuration
The most important part of the module, the presets.
They're made of a a key with an array of actions to apply.
The key is the name of the preset you will use in the URL.
My recommendation is to put the size of the final image in the preset name, this allows for more reusability in your presets. Because if you create a rule named for example "thumbnails" and that your layout changes the sizes of your thumbnails but only in some places, you'll soon end up with a mess with your preset names.
Preset structure
Action structure
Complete list of actions and options
Example
Retina Images
This package also helps to generate image for retina displays. there are two ways for this.
With plugins like retina.js the page will automatically try urls with @2x just before the extension.
When a normal image's url is /images/cache/200x200/koala.jpg it will resolve to the original file koala.jpg.
But if you call the url /images/cache/200x200/[email protected] it will also resolve to the file koala.jpg.
This will take the 200x200 preset and double all it's values, so if you crop your images to 200x200 pixels, it will now be a 400x400 pixels image.
And it will save it back to images/cache/200x200/[email protected] so your apache/nginx will be able to serve it on next visit.
