Add more image post-processing and compressing method and options.
I scan image with 600dpi, it is approximately 45 MB (PNG format, and for JPEG format, it is a little bit smaller), however, when I open this PNG file by eog
and click Save As
as JPEG format, it is less than 5 MB without reducing any resolution eve if the color is a little bit different, but for document scanning, it doesn't matter.
The number mentioned above may not so accurate or may be different from different scanning, but there is indeed a big difference.
Due to privacy issue, here I won't attach the sample image of my own document. This experiment can be reproduced on the majority computers of GNOME developer, since eog
is also a project of GNOME.