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  1. #1
    D Ink Man is offline Senior Member
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    Default Standard or Approximate Densities for GRACoL 7 Process Inks ?

    Please provide information for an approximate density or density range for GRACoL 7 on Coated Paper Stock. I know this can vary somewhat, methinks, but please provide data in your experiences wth the four process colors Thank you in advance for your input.

    Key________
    Cyan_______
    Magenta ________
    Yellow ________

    If you would like to additionally provide the same for Offset Uncoated and Mattes/Silks that would be seen as a bonus.

    As many of you may know, X-Rite (Pantone) no longer supplies process swatches in their most recent creation. Pantone+ Plus. This is just a side note. Thanks!

    D

  2. #2
    gordo's Avatar
    gordo is offline Senior Member
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    These are the published classic ones for sheetfed on premium coated paper for 175 lpi measured Status T dry (not wet) the values are:
    Black 1.70 Dot gain (TVI) 22:
    Cyan 1.40 Dot gain (TVI) 20
    Magenta 1.50 Dot gain (TVI) 20
    Yellow 1.05 Dot gain (TVI) 18

    best, gordo

  3. #3
    D Ink Man is offline Senior Member
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    Thank you sir. D

  4. #4
    turbotom1052 is offline Senior Member
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    wet readings on status T
    black 1.75
    cyan 1.50
    magenta 1.40
    yellow 1.00
    these are the default numbers we have plugged into our intellitrax. We try not to deviate more than .05 up or down on any color.
    Last edited by turbotom1052; 01-15-2013 at 04:10 AM.

  5. #5
    D Ink Man is offline Senior Member
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    The thing I find interesting is the relatively high cyan values for G7 versus say traditional SWOP.

  6. #6
    gordo's Avatar
    gordo is offline Senior Member
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    Quote Originally Posted by D Ink Man View Post
    The thing I find interesting is the relatively high cyan values for G7 versus say traditional SWOP.
    AFAIK G7 or GRACoL 7 does not reference SID numbers, instead they target lab values.
    SWOP is an input specification not a print specification. They have never, AFAIK, published target SID values. Instead, they sold a target high/low density strip that printers were encouraged to measure with their own instuments. The traditional SID values that I gave were extrapolated from, AFAIK, the press proofs that accompanied supplied ad films back in the day.

    @turbobottom, unless you are running a KMCY ink sequence your SID targets for C and M are very unusual.

    Best, gordo

  7. #7
    joe pasky is offline Junior Member
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    G7 densities and dot gain values that you may see published are only 'informative'.

    The process ink target values for solids are ISO-specified L*a*b* colors:
    K = 15/0/0
    C = 55/-37/-50
    M = 48/74/-3
    Y = 89/-5/93


    Nominal 'informative' TVI values for #1 and #2 coated are:
    K = 20%
    C = 16%
    M = 16%
    Y = 15%

    NPDC (relative) density values take precedent:
    CYM/K
    25% = 0.25/0.22
    50% = 0.54/0.50
    75% = 0.90/0.90

    "Since 2006 neither GRACoL, nor SWOP nor G7 have specified solid ink densities or TVI (dot gain) values. Legacy solid densities nor TVI (dot gain) values are not longer valid" - Idealliance Printing Guidelines 2011

    jjp


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