Public bug reported:
Scanner ID: Bus 001 Device 004: ID 04b8:0852 Seiko Epson Corp.
"I have a good faith belief that this is a bug in Simple Scan and not in
sane-backends because I actually tried with xsane and it worked there."
Essence of problem: I do not see difference in files saved after change
of setting between 300dpi vs. 600dpi for images or 150dpi vs 300/600dpi
for text
Here I make my point based on the file sizes.
The following files were generated by Simple Scan in various Text/Image 300/600
dpi settings.
~/tmp/ocr_try$ ls -lh ss*
-rw-rw-r-- 1 user1 user1 2,2M feb 9 19:43 ss_image_300dpi.png
-rw-rw-r-- 1 user1 user1 2,2M feb 9 19:53 ss_image_600dpi.png
-rw-rw-r-- 1 user1 user1 77K feb 9 19:44 ss_text_300dpi.png
-rw-rw-r-- 1 user1 user1 79K feb 9 19:52 ss_text_600dpi.png
For comparison, files obtained by scan with various settings in "Image Scan!
for Linux" from Epson:
~/tmp/ocr_try$ ls -lh is*
-rw-rw-r-- 1 user1 user1 96K feb 9 20:31 is_150dpi_text_bw.png
-rw-rw-r-- 1 user1 user1 702K feb 9 20:26 is_300dpi_image_bw.png
-rw-rw-r-- 1 user1 user1 2,2M feb 9 20:18 is_300dpi_image.png
-rw-rw-r-- 1 user1 user1 261K feb 9 20:24 is_300dpi_text_bw.png
-rw-rw-r-- 1 user1 user1 789K feb 9 20:21 is_300dpi_text.png
-rw-rw-r-- 1 user1 user1 2,6M feb 9 20:25 is_600dpi_image_bw.png
-rw-rw-r-- 1 user1 user1 7,9M feb 9 20:20 is_600dpi_image.png
-rw-rw-r-- 1 user1 user1 851K feb 9 20:25 is_600dpi_text_bw.png
-rw-rw-r-- 1 user1 user1 2,5M feb 9 20:20 is_600dpi_text.png
Note that "Simple Scan" Text file size for 300/600dpi settings roughly
corresponds to "Image Scan" 150dpi for B&W Document (150dpi is default for Text
in "Simple Scan"), while "Simple Scan" 300/600dpi Image corresponds to "Image
Scan" 300dpi Color Photo settings.
Another couple of scans acquired with XSane:
~/tmp/ocr_try$ ls -lh xsane*
-rw-r----- 1 user1 user1 772K feb 9 21:18 xsane_300dpi_gray.png
-rw-r----- 1 user1 user1 2,9M feb 9 21:17 xsane_600dpi_gray.png
Note that sizes of XSane generated files roughly match to "Image Scan"
300dpi B&W Image and 600dpi B&W image.
I think that it is very important to have ability to make scans with 300dpi B&W
settings since those are recommended settings for better OCR performance.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: simple-scan 3.6.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-24.37-generic 3.5.7.4
Uname: Linux 3.5.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Sat Feb 9 21:03:53 2013
DriverPackageVersions:
libsane 1.0.23-0ubuntu1
libsane-extras N/A
hplip 3.12.6-3ubuntu4
hpoj N/A
InstallationDate: Installed on 2012-06-28 (226 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-24-generic
root=UUID=44ee0b94-7db6-4348-a0ab-a3889128485f ro quiet splash
SourcePackage: simple-scan
UpgradeStatus: Upgraded to quantal on 2012-12-21 (49 days ago)
dmi.bios.date: 09/16/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.10
dmi.board.name: HM65-MXM
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrP1.10:bd09/16/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnHM65-MXM:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
** Affects: simple-scan (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity
** Attachment added: "Debug logs collected for 300dpi and 600dpi settings via
"simple-scan --debug > simple-scan_x00dpi_text.log 2>&1""
https://bugs.launchpad.net/bugs/1120584/+attachment/3522442/+files/simple-scan-debug-logs_300dpi_vs_600_dpi.tar.gz
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https://bugs.launchpad.net/bugs/1120584
Title:
DPI settings do not influence scan result on Epson Stylus Photo PX710W
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