On Ubuntu 16.04, pdfimages -all produces image files whose sum of storage use is greater than the PDF files from which they came.
Is there any explanation for this? How can I extract image files that are no larger than the size they're using on the .pdf without compensating on picture quality?
Note: I've tried an approach that uses the pdftohtml command (Extracting embedded images from a PDF) but the files don't seem to allow me because of some kind of permission relating to extracting text (I get the error: Permission Error: Copying of text from this document is not allowed.).
