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 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to simple-scan in Ubuntu. https://bugs.launchpad.net/bugs/1120584 Title: DPI settings do not influence scan result on Epson Stylus Photo PX710W Status in “simple-scan” package in Ubuntu: New Bug description: 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. 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