simple-scan-team team mailing list archive

[DemoFreak <891586@xxxxxxxxxxxxxxxxxx>]

As I figured out just now, the sane tools behave different regarding the
resolution:

- xsane respects the selected resolution (tested with 300, 600 and
1200dpi). The output files differs in size by factor 4, as expected.

-rw-r----- 1 hannes users  25658079 14. Apr 19:36 test0001.pnm
-rw-r----- 1 hannes users 102666906 14. Apr 19:37 test0002.pnm
-rw-r----- 1 hannes users 410624709 14. Apr 19:38 test0003.pnm

- scanimage always scans with 600dpi (like simple-scan does), regardless
what's given by --resolution parameter. The output files are similar in
size.

hannes@gurkenkiste:~> scanimage -d pixma:04A91908 --resolution 300 --mode Color --source Flatbed >test1
hannes@gurkenkiste:~> scanimage -d pixma:04A91908 --resolution 600 --mode Color --source Flatbed >test2
hannes@gurkenkiste:~> scanimage -d pixma:04A91908 --resolution 1200 --mode Color --source Flatbed >test3

-rw-r--r-- 1 hannes users 107429029 14. Apr 19:51 test1
-rw-r--r-- 1 hannes users 107429029 14. Apr 19:51 test2
-rw-r--r-- 1 hannes users 107429029 14. Apr 19:51 test3

So it seems the problem is located in an interaction of the scan
frontend and the sane backend (as scanimage/simple-scan are able to scan
with the configured resolution when using other devices, and on the
other hand xsane is able to scan the desired resolution with _this_
specific device).

Any hint to narrow down this issue a little further?

/Hannes

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Scan Development Team, which is the registrant for Simple Scan.
https://bugs.launchpad.net/bugs/891586

Title:
  Resolution control not working

Status in Simple Scan:
  Triaged

Bug description:
  Details in my Ubuntu Forum thread: 
  http://ubuntuforums.org/showthread.php?t=1648771
  Quote:
  "Firstly - congratulations for Simple Scan, which lives up to its name admirably!
  Xsane is no doubt wonderfully competent, but far too complicated for casual use.
  But I am having a problem with Simple Scan, in that I can't seem to get selected resolutions to have any effect.
  A typical A4 mainly-text document I am playing with, ends up as:
  165K when scanned & saved as text pdf at 75/150/300 or 600dpi...
  1.5MB when scanned & saved as text jpg at 75-600dpi
  2.2MB when scanned & saved as photo pdf or jpg at 75-600dpi.
  My Epson V200 scanner allows normal resolution selection with Xsane or with Epson's iscan application.
  Thanks for any suggestions!" - unquote.

  I started that thread in December 2010 & still have the same problem today.
  As a summary - the resolution control has absolutely no effect on the results.
  No error messages (unless I try 2400dpi) & nothing in simple-scan --debug >simple-scan.log
  I now have Simple Scan 2.32.0.1-0Ubuntu2 in Ubuntu 11.04.
  The scanner is an Epson Perfection V200 Photo & has normal resolution selection in XSane & Iscan.
  Thanks!

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