Color Matching - purpleish over blue/black

Discussion in 'Small Format Inkjet Printers' started by garym, Jun 14, 2019.

  1. garym

    garym New Member

    Joined:
    Jun 2019
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    Location:
    california
    Hi everyone!
    I have a canon pixma ix6820. I'm printing on a variety of glossy papers - some epson, others HP. It seems the color profile does not correspond for the deep blues and charcoal blacks - they print as purple.

    Some searching around has shown this could be the ICC profile for printing. Canon support wasn't able to solve this, how would you go about fixing this so my long exposures of the night sky show black and blue rather than magenta/purple?

    Note, I've done cleanings, replaced the ink, and all other colors are crisp.

    Thanks!

    https://photos.app.goo.gl/a1XPXDoe5zPMym1Y7
     
  2. Biggs

    Biggs Senior Member

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    Location:
    Edison, NJ
    It sounds like a rendering intent issue. The RGB blue from your photo is out of gamut, and coverts to CMYK as purple.
    Small printers don't have a tremendous amount in the way of color profiling or color management, But there might be an operater setting meant for photo printing.
    Otherwise you may have to color correct the image in photo editing software prior to print.

    I'd have a lot more solutions had this been a production device, but the personal printers haven't many options available to them.
     
  3. garym

    garym New Member

    Joined:
    Jun 2019
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    Location:
    california
    Thanks Biggs!
    Understanding the limitations of this printer, there are ICC profiles I can choose from using the Canon ColorSync options when printing. There's two ways I've been experimenting, but not finding success ( see images attached below )
    1. using mac Preview - Color Matching > ColorSync > choose ICC profiles
    2. using Canon Easy-Photoprint Editor > Color Options > reduce the magenta amount

    I seem to need a new ICC profile for 1 to work
    for 2 to work, I've experimented with -10 to -30 for magenta & the -30 is great! problem is, it removes from all over on the print job and some parts lose their sharpness.

    Would either of these methods, or a separate 3rd, work in your mind?
    previewPrintColorICCs.png canonEasyPrintOptions.png
     
  4. Biggs

    Biggs Senior Member

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    Location:
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    I would I could help for with the output profile, I'm rather familiar with the production print world's industry standards, but not so much these.

    Instead of removing so much magenta, thus leaving a void in your overall density, try removing some magenta, and adding in some Cyan. Thus balancing the temperature of the image, and keeping the overall ink saturation the same.
     

  5. I.T. Supplies

    I.T. Supplies Member

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    Location:
    Rolling Meadows
    You most likely want a custom profile to correct these issues; or need the monitor calibrated properly to manage the profile more accurately. What you are seeing on screen may not come out the way it should be if the settings are not selected properly (media type, profile, color metric option, black point compensation, etc) and if you have color management selected in both printer driver and profile option.

    As long as all these options are chosen properly, you should be ok (device wise). If the nozzle check comes out ok, it may be the profile issue OR you have printer and software managing colors which you're double profiling it and thus will show issues.

    We handle anything from standard desktop printers (Epson Workforce) up to large commercial printing (HP Flatbed). If you need a profile, we can surely make one; or you can contact us to go over all settings to make sure everything is selected correctly for the best output.

    IT Supplies
     
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