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Basically, you want to avoid spam / mailing filters.
There's not going to be a magic bullet solution for this.
I'd recommend reading the format specifications for JPEG and GIFs, work out where you can inject padding into the file/contents - and then just inject random data into there that won't be displayed when the image decodes.
I can't be the first to think of that, so I bet filters already check for it - but, that will achieve your purpose of changing the base64 output as much as you want.
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