On Tue 01 Jan 2019 at 12:34:38 -0500, kamaraju kusumanchi wrote: > A scanned document from Canon pixma mx870 printer is significantly > larger compared to the same document scanned on a different scanner.
Which is...? > When I look at both the images side by side on a PC, there is no > visual difference between the two. I am trying to understand the > underlying cause and fix it if possible. You could mention which scanning software you used and what the setting for the output file format was. > As shown below, scanned_in_office.pdf is 332Kb, scanned_on_mx870.pdf is 1.7 > Mb. > > % ls -al scanned_in_office.pdf scanned_on_mx870.pdf > -rw-r--r-- 1 rajulocal rajulocal 331796 Jan 1 11:54 scanned_in_office.pdf > -rw-r--r-- 1 rajulocal rajulocal 1775460 Jan 1 11:48 scanned_on_mx870.pdf > > Both are are scanned at 600 dpi. The only difference I see is in bpc, > enc fields. > > % pdfimages -list scanned_in_office.pdf > page num type width height color comp bpc enc interp object ID > x-ppi y-ppi size ratio > -------------------------------------------------------------------------------------------- > 1 0 image 5104 6600 gray 1 1 ccitt no 7 0 > 601 600 183K 4.5% > 2 1 image 5104 6600 gray 1 1 ccitt no 14 0 > 601 600 138K 3.4% > > % pdfimages -list scanned_on_mx870.pdf > page num type width height color comp bpc enc interp object ID > x-ppi y-ppi size ratio > -------------------------------------------------------------------------------------------- > 1 0 image 5100 6600 gray 1 8 jpeg no 8 0 > 600 600 1066K 3.2% > 2 1 image 5100 6600 gray 1 8 jpeg no 14 0 > 600 600 665K 2.0% > > Questions: > 1) Does the large file size have anything to do with the printer > itself? Is there anything I can do (ex:- update the driver/firmware or > something)? Not at all; the printer has nothing to do with it. Printing is printing. Scanning is scanning. > 2) Is the difference in image sizes due to the bpc (1 vs. 8) or > encoding (ccitt vs jped) fields? Could be. > 3) If yes, how to change them? One file is in (I think) tiff format. The other isn't. You didn't scan like and like from both devices. -- Brian.
