Hi, I'm uploading images (represented by a FileField) and I need to rename those files when they are uploaded. I want them to be formated like that "%d-%d-%s.%s" % (width, height, md5hash, original_extension) I've read the documentation and I think a need to write my own FileSystemStorage class but how can I get the md5 hash and the image resolution if the file isn't saved yet ?
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