Here's another example - photo taken as carefully as I could (with proper white balance) - on the right is the original image, top left a CMYK version printed and below an RGB version printed.
What is most revealing, I think, is the white to black gradient on the bottom left of each image. Although the CMYK model doesn't have as high contrast, it is at least a pretty accurate ramp, whereas with the RGB model something clearly goes very wrong a quarter of the way into the black end. This really needs to be addressed - it looks like it probably effects an awful lot of people! ** Attachment added: "CMYK vs RGB printing using CUPS/PIXMA" https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1181884/+attachment/3980048/+files/printingtest.jpg -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1181884 Title: Canon MG6200 printer driver has incorrect default color model Status in “cups” package in Ubuntu: Confirmed Bug description: Installed my Canon MG6220 printer today using the Printers applet in System Settings. It found it right away and I chose the recommended Gutenprint driver: Canon PIXMA MG6200. Without changing a single setting I clicked on Print Test Page. You can see the result in the attachment, RGB-default.jpg. Colors are drab and lifeless, nothing like when I print a test page in Windows 7 on this same PC/Printer combination. I did a web search, immediately found others had fixed this issue on their Canon printers by changing the "Color Model" setting on the Gutenprint driver from the default of RGB to use CMYK instead. Changed that easily under Printer Settings | Printer Options | Color Model. Immediately printed another test page, results are attached as CMYK.jpg. See for yourself, I can't put it any other way than, "colors are fixed." I have no idea how Gutenprint finds or defines a color model for a printer, but it is definitely incorrect for the Canon MG6200 series. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: cups 1.6.2-1ubuntu5 ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8 Uname: Linux 3.8.0-21-generic i686 NonfreeKernelModules: nvidia ApportVersion: 2.9.2-0ubuntu8 Architecture: i386 Date: Sun May 19 20:05:43 2013 EcryptfsInUse: Yes InstallationDate: Installed on 2013-05-14 (5 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424) Lpstat: device for Canon-MG6220: usb://Canon/MG6200%20series?serial=6326B8&interface=1 MachineType: Dell Inc. XPS 8500 MarkForUpload: True Papersize: letter PpdFiles: Canon-MG6220: Canon PIXMA MG6200 - CUPS+Gutenprint v5.2.9 ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-21-generic root=UUID=57957c00-d8e8-45e9-b06d-d065d3a70465 ro reboot=acpi SourcePackage: cups UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/05/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0NW73C dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA09:bd09/05/2012:svnDellInc.:pnXPS8500:pvr:rvnDellInc.:rn0NW73C:rvrA00:cvnDellInc.:ct3:cvr: dmi.product.name: XPS 8500 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1181884/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
