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Unable to achieve a flats seamless grey with CMYK

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  • Unable to achieve a flats seamless grey with CMYK

    I have a print job with grey color that needs to be even and patch less. I tried to print that using C 10 M 11 Y 10 K 25 after referring the CMYK Pantone guide and got that printed using 175 LPI. But that did not work . I dont see a seamless even grey and it shows patches (Pic Attached but might not give a complete idea) . My Printer then printed the same paper using another job with K 30 alone. While it was still not that great as I expect my grey to be but atleast better than the former one. I Cannot use pantone grey for this one as the budget of the project does not permit me. What should I do ?
    cmyk dots k 30 dots CMYK Grey Output

  • #2
    Offset? Flexo? Or? Why don’t the microphotos have color?

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    • #3
      gordo - Sorry , I forgot to mention. It is offset printed and the substrate is Art Paper. I took the micro photograph by placing my phone over a 25X Microscope . This is what I could get from my phone.

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      • #4
        Originally posted by manishbjain View Post
        gordo - Sorry , I forgot to mention. It is offset printed and the substrate is Art Paper. I took the micro photograph by placing my phone over a 25X Microscope . This is what I could get from my phone.
        The reason I asked is because the dots are black and grey. But if they're color...
        1 - Does the paper have a texture? The grey area looks like it has striations which could be caused by a paper texture.
        2 - If the paper has no texture then the striations could be on the printing plates. That can be caused by a laser problem when the plates were exposed.
        3 - If you're referring to the shift in color in the grey that can be caused by many press factors.
        4 - Your CMYK recipe C 10 M 11 Y 10 K 25 uses too much of the chromatic colors. That can affect color stability. Try a recipe like C 0 M 5 Y 2 K 47 - it should give you the same final color but with greater press stability as it minimizes use of the chromatic colors.
        Last edited by gordo; 10-04-2018, 12:14 AM.

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        • #5
          Originally posted by gordo View Post

          The reason I asked is because the dots are black and grey. But if they're color...
          1 - Does the paper have a texture? The grey area looks like it has striations which could be caused by a paper texture.
          2 - If the paper has no texture then the striations could be on the printing plates. That can be caused by a laser problem when the plates were exposed.
          3 - If you're referring to the shift in color in the grey that can be caused by many press factors.
          4 - Your CMYK recipe C 10 M 11 Y 10 K 25 uses too much of the chromatic colors. That can affect color stability. Try a recipe like C 0 M 5 Y 2 K 47 - it should give you the same final color but with greater press stability as it minimizes use of the chromatic colors.
          No , The Paper doesnt have any texture. I do not actually understand what you mean by the shift in the color change . The thing is I am not getting a flat seamless colour that looks even through out. However, Let me try and check if the recipe you have recommended works.

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          • #6
            Originally posted by manishbjain View Post

            No , The Paper doesnt have any texture. I do not actually understand what you mean by the shift in the color change . The thing is I am not getting a flat seamless colour that looks even through out. However, Let me try and check if the recipe you have recommended works.
            Check point #2 since there’s no paper texture.
            The grey patch in the pic you posted has a color shift from top to bottom so I thought that might be the issue. If point #2 is the issue then the different cmyk recipe won’t help.

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            • #7
              Originally posted by gordo View Post

              Check point #2 since there’s no paper texture.
              The grey patch in the pic you posted has a color shift from top to bottom so I thought that might be the issue. If point #2 is the issue then the different cmyk recipe won’t help.
              No I do not think the striations is the problem. Its basically the unevenness in the color that I am talking about.I do not know how to convey that in the exact terms. I want an even color patch like what we usually get using a 100 percent screen of any color , say a pantone or any process color. If you could see the cmyk microphoto, the dots are smudged unlike the dots in the single color K. Could that be a reason for that ?

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              • #8
                Another thought-
                compare several sheets, notice any ‘doubling’ or distortion of any of the dots?
                i had a similar problem with a 2-color screen job - it was dot shape - changing the tonality.

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                • #9
                  Originally posted by danremaley View Post
                  Another thought-
                  compare several sheets, notice any ‘doubling’ or distortion of any of the dots?
                  i had a similar problem with a 2-color screen job - it was dot shape - changing the tonality.
                  Thankyou danremaley - Let me check that too.

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                  • #10
                    I'm not a pressman but my pressman uses to say printing a seamless large area of halftoned color is way difficult so he always asks me to convert it to a spot color one.
                    So I can assume is a press matter.

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