Monday, February 23, 2009

AM Screening Dot Shapes

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13 comments:

  1. Gordon,
    I'm a dot man myself...prefer the Euclidean..round square round- it may be a new lifestyle. Also like pushing the envelope with FM; can we please stop calling it staccato??!! next we'll think Kodak (Creo) invented the press!!!!

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  2. To Dean,

    As long as the printshop understands their options they can at least make an educated choice as to which screening methods best fits their needs. Just having a preference, without objective and specific reasons is, IMHO, insufficient to making the correct decision.
    I think that FM is often referred to as "Staccato" for the same reason that facial tissue is called "Kleenex" or photocopies "Xeroxes." The most successful implementation tends to lend its brand name to the product - though it should not imply that it represents the "best" implementation.
    Thanks for taking the time to comment - it's much appreciated!
    best, gordo

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  3. I agree with Gordon, it really depends on the printing shop you are dealing with. Our company has switched between a few shops just due to meticulous details they seem to miss which impacts the final product. Luckily we finally found one that seems to have the correct answers to tough printing decisions.

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  4. Can the halftone: Line dot be used in letterpress and/or screen printing?
    How are line dot halftones made?

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  5. Morgan PrintingJun 10, 2010 06:08 AM

    Went from round dot to eliptical, single color at 45 degrees. A big difference on our digital plate printing.

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  6. I would be interested in what you mean by a "big difference on our digital plate printing."

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  7. Yes, me too...

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  8. plz post single single dot shapes . that must b in microscopic view

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  9. @chattu - click on the pictures above to enlarge them. If that's not large enough, contact me by email and send me a sample of what you want and I will try to do it for you. My email is pritchardgordon @ gmail (dot) com

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  10. No matter what type of AM screening I use i get patterns. CTP Screen ptr-4300 with amigo plates at 2400dpi 175-200lpi. I can, by experience figure out almost every time that it was printed with a Harlequin RIP. What should I do ???

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  11. You have to be more specific.

    What kind of patterns? Do they occur in single colors or only in multi-color. What color is the pattern? What screen angles are being used. Are you using HQS screening or RT? Etc., etc.

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  12. Hello Gordon.
    I work with Dolev 800v and I would like to use an elliptic dot but this one is not in the list. I just have "gravure", "square", " geometric " and " fulltone ".
    What is that we can create or load a new point?
    Thank you in advance.
    Emilie

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  13. Hi Emilie,

    I don't do customer support for Kodak products - you should contact them.

    But I can give you some guidance.

    "Gravure", " geometric " and " fulltone " are Scitex Turbo Screening dot shapes. None of them will give you an elliptical shaped dot. You should also have the standard screen sets installed. They include "composed" "composed rotated" "diamond" and "diamond rotated"

    Composed, Composed Rotated, Diamond, and Diamond Rotated may be considered as “traditional” halftone screens. And are the basis for creating your elliptical screen.

    Composed and and Diamond dots can take on an elliptical shape by manipulating the advanced parameter "D-RATIO." D-Ratio values range from 21 to 100 % for Composite and Diamond dots. A D-RATIO of 100 creates a round dot with the "composed" dot, or a square dot with the "diamond" dot shape selected. A D-RATIO of 21 gives what looks like a line screen (a.k.a.Scitex "geometric" dot). A D-RATIO of around 70 should provide a decent elliptical dot.

    The D-RATIO is accessed through the Scitex Brisque or PS/M workflows. Creo bought Scitex and then Kodak bought Creo. So I do not know if the screening is still supported or if the D-RATIO is adjustable within any other workflow

    I hope this at least helps a bit.

    best, gordo.

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