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The trouble with fields in drupal with a limited number of items (cardinality), is they always show all of those field inputs, regardless of whether they are set.
This module provides an input filter that allows WYSIWYG embedded images to be restyled using Drupal's Image Styles functionality, rather than forcing the content editor to upload scaled/cropped images. Design decisions regarding thumbnail sizes for embedded files may be easily changed later (by simply updating the image style) without having to re-edit existing nodes.
It also provides some "glue" support for modules like Lightbox2. The module can apply CLASS and REL tags to the image and/or a link wrapper to the original file that Lightbox2 can use when displaying galleries.