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The prupose of this module is to pre-generate styles via rules.

DO NOT USE THIS IN PRODUCTION. THIS IS AN EXPERIMENTAL MODULE.

For Drupal 8 i have writte something similar, that do es not use rules.
https://www.drupal.org/project/image_style_folder

Why

Normally the image derivates get created on request. But what if you want to display informations on presets, without displaying them. Like a download link with an info on size, resolution...then the image must already exist.

Rules

This module is a plugin for the great Rules module
http://drupal.org/project/rules
So you can use rules to only run it on special node types and actions. I personally use it to generate the styles on "node save and node update".

Alternative Modules

http://drupal.org/project/imageinfo_cache

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