Discussion: View Thread

  • 1.  G7 ink value?

    Posted 09-25-2024 08:13 PM

    Hello.

    I work for a gravure printing company in a non-English speaking country.
    Recently, I checked the GRACoL2013 Colorimetric Values ​​while preparing for G7 certification.

    1. The L,a,b values ​​are too different from the inks I am currently using.
    2. I need a complex ink mixture to match the L,a,b values ​​of the GRACoL2013 Colorimetric Values.
    3. I want to adjust the graybalance using the existing inks I am using to ensure the repeatability of the prints.
    4. Is it possible?



    ------------------------------
    Lee-Seul Choi
    UWRAPCO
    82-10-7159-6971
    ------------------------------


  • 2.  RE: G7 ink value?

    Posted 18 days ago

    If all you're looking for is G7 gray balance and tonality as a method of calibration/linearization, you can do this with virtually any set of CMYK inks. The results should give you G7 Grayscale compliance and a good foundation for creating an output profile.....but will NOT give you G7 Targeted or Colorspace compliance. If you want that, you'll need to profile your device and then set up a color management conversion that sets GRACoL as your source/simulation profile and the profile of your device as the output profile.



    ------------------------------
    Terence Wyse
    Senior Color Specialist
    Shutterfly
    Fort Mill SC
    (704) 207-4054
    ------------------------------



  • 3.  RE: G7 ink value?

    Posted 18 days ago
    Right you are, Terry (as usual), but let's add that normally these "print-to-print" transformations in conventional printing require the creation and use of device link profiles. That is no reason not to do it, but it is the primary reason why so few printers apply any color management in their workflows other than for proofing and other digital printing: The process is simply too alien to them, so they try to use these "1D" approaches: correction curves, density adjustments, etc., all doomed to failure in varying degrees.

    Mike









  • 4.  RE: G7 ink value?

    Posted 17 days ago
    Packaging printers have been aligning solids to CRPC6- targeted is not difficult for a buttoned up printer. G7 curves for most good flexo printers along with close CMYK values seems to be more forgiving the ICC workflows.
    Steve Smiley
    SmileyColor & Associates
    PO BOX 1015
    Bacliff TX, 77518 USA
    469-309-2025
    Steve@...




  • 5.  RE: G7 ink value?

    Posted 16 days ago

    Agreed that having inks whose solid Lab values align with 12647-2 (e.g. CRPC-6) makes things a whole lot easier if matching offset-printed originals and may even obviate the need to profiles. I think the question was about how to handle a situation where there is existing work that was printed under different conditions, with different inks--in any event, this is a common situation, and in this case a device link conversion may be the only efficient path forward for those jobs. 



    ------------------------------
    Mike Strickler
    MSP Graphic Services
    ------------------------------



  • 6.  RE: G7 ink value?

    Posted 12 days ago
    Edited by Danial Hahn 12 days ago

    This was completed about 8 years ago at Westrock with Huber's Packaging Plus Ink series first. Then INX Aligned. We had Huber adjust their ink tacks to when you hit lowest DE or Best Match the traps would fall under 2.0. Works great however there are drawbacks on misting. Yellow tack is very low so you have to be very cognizant of water pickup and Do your due diligence on compatibility to get the best results. There are a number of very good working chemistries out there with these inks. Really has made printing to the numbers that simple.



    ------------------------------
    Danial Hahn G7 Expert
    Printing Manager
    Lewisburg Printing Company
    Lewisburg TN
    (931) 359-1562
    ------------------------------



  • 7.  RE: G7 ink value?

    Posted 12 days ago

    I guess you can say there is a Gracol / G7 Ink set now too. Makes curve management sooooo much easier.



    ------------------------------
    Danial Hahn G7 Expert
    Printing Manager
    Lewisburg Printing Company
    Lewisburg TN
    (931) 359-1562
    ------------------------------



  • 8.  RE: G7 ink value?

    Posted 12 days ago
    It is always preferable to recreate the print conditions wherever possible, including the use of curves and slight density adjustments. When this isn't possible profiling and devicelink conversions are valuable, even essential tools.


    Mike Strickler | MSP Graphic Services


    I guess you can say there is a Gracol / G7 Ink set now too. Makes curve management sooooo much easier.


    ------------------------------
    Danial Hahn G7 Expert
    Printing Manager
    Lewisburg Printing Company
    Lewisburg TN
    (931) 359-1562

    ------------------------------