Are there any frameworks/libraries that provide servlets/filters etc that handle reencoding on the fly of images.

• interpret the accept headers and output the file, reencoding into the new format if necessary by checking the actual format of the original image file.
• provide a low and high quality version of an image.
• re encode an image into new dimensions. width and height parameters might query string parameters.

I could create versions of the file in all the formats, at upload time but the seems overkill. I would rather lazily create the rencoded file and stick it in a cache if it gets served again etc.