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image handling  RSS feed

Pat Wallwork
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I'm not sure what the appropriate forum is for this question but since my site is mostly done using jsp I'll put it here...
I allow users to upload images to my site. Of these, I need a full size and a thumbnail image. Currently the users can upload both but I would like to save them an extra step. Also, since some users are inexperienced, I get images uploaded that are not optimized and are a rather large file size.
Does anyone know of a way that I can optimize and resize images that are uploaded through the browser?
It is sorta covered in the JavaRanch Style Guide.
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