Different PDF compression types?

[itisljar]

Greetings everyone.

I don't know much about PDF except basics. I've bought new multifunction device, Brother MFC-L5715DN. When exploring scanner software option, I've noticed one document saving option which is called High Compression PDF, and it is used when scanning at 300 DPI. Files are around 10 times smaller than standard compression ones. When I checked with hex editor, I didn't find jpeg headers at all, like these ones (I am sorry, these headers look like this when pasted:

`GB

stream
˙Ř˙ŕ �JFIF ����,`

These are absent form high compression one, which follows:

`DeviceRGB

stream
H
ě· XS×Ú6Ľ`

Is it Jpeg XS? And more importantly, can it be implemented into NAPS? It would be a great addition.

Thank you for making this app, it's been very useful to me and my friends.