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Re: [OT] scanned files are large in size




On Tue 01 Jan 2019 at 22:51:02 -0500, kamaraju kusumanchi wrote:

> On Tue, Jan 1, 2019 at 3:04 PM Brian <ad44@xxxxxxxxxxxxxxx> wrote:
> >
> > 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...?
> 
> Do not have this information at the moment. Will provide it tomorrow.
> 
> > > 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.
> 
> Both images are obtained from the scanners directly. I did not use any
> specific software per se. The only setting I had to choose was the dpi
> - which in both cases is set to 600.

Ah, I think I see now. You used a button on the device to initiate a
scan. I was thinking in terms of something like xsane being used.

> > > 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.
> >
> 
> Understood. This is an 'all in one' printer which has both printing
> and scanning capabilities.
> 
> > > 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.
> 
> There are not that many options to choose from the scan settings. You
> just choose the dpi and that is about it.
> 
> I understand that we can't change much on what the scanner produces.
> But there should be some software to further change the scanner's
> output files?

Jörg-Volker Peetz has indicated a technique; it can work. For a smaller
file size you could also reduce the resolution from 600.

-- 
Brian.