Method: Ensure we are dealing with the correct image attachment

Method: Only regenerate images for the requested size.

Method: Generate the thumbnail filename and dimensions for a given file.

Method: Regenerate the image according to the required size

Method: Image downsize, without this classes filtering on the results.

Method: Get list of images and queue them for regeneration

Method: See if an image’s dimensions match actual settings.

Method: Show notice when job is running in background.

Method: Dismiss notice and cancel jobs.

Method: Regenerate images if the settings have changed since last re-generation.