Color Matching - purpleish over blue/black

Discussion in 'Small Format Inkjet Printers' started by garym, Jun 14, 2019 at 12:23 PM.

  1. garym

    garym New Member

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    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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    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

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    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.
     
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