Trying to make such things:
convert img.jpg img.pdf
pdfimages -j img.pdf img1
Comparing source and extracted images in HEX shows difference. How to make such conversion without data loss?
One way is to use
You need in a extra file, which is here called
Are you sure that there's an entire JPEG - metadata and picture data, in JFIF/JPEG format within the PDF? If not, then even if the image data is extracted verbatim,
You can get a similar situation with audio files and tags etc. - you can't do sum comparisons if you change the metadata.
IN that situation, you need to calculate hashes for just the data portion, rather than the whole file.