Sunday, February 14, 2010

The principle of dot gain compensation plate curves

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7 comments:

  1. It is a great blog with lots of usefull information. Your posts are very informative and easy to understand. Thank you and keep it up!!

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  2. it is really helpful,brilliant blog! you are the best of the best in color management.

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  3. Is it normal to have a big difference in dot gain values (i.e. for yellow) just changing the screen angle?

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  4. Is it normal the following issue?
    Having a 32% dot gain in Yellow, after changing its screen angle we obtain a 24%.
    Nothing more has been changed.
    I don't understand.
    There is any reason for this?

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  5. Yes it is possible for the dot gain to change if the screen angle changes.
    This can happen with an elliptical dot screen if the press has a slight slur or doubling problem. Slur and doubling are directional problems and increase ink at the back of the dot (i.e. opposite of the direction of the sheet through the press.
    If the dot shape is elliptical then the back edge will be smaller if the dot is more inline with the direction through the press. If the elliptical dot shape is angled more across the width of the press sheet then the back edge of the dot will be larger and therefore the dot gain will be larger.

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  6. We are using Harmony system with Kodak Prinergy CTP. We have done plate calibration and the result was good. But now it isn’t. Do you have an experience in correcting calibration curve – not making it from the beginning because a calibration curve was applied?I read about this possibility in Harmony user guide in “Using calibrated data" chapter. But it isn’t clear for me. Where can I take the necessary curve ID?

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  7. @Dimitry

    I'd rather not do what I consider to be Kodak customer support. For better or worse - that's their job.

    What I will say is: If you had a plate calibration which gave a good result but now it isn’t - you need to find out what has changed. Building a curve to "fix" it will probably just cause more problems.

    It's the same thing for using "calibrated" data. It's better to keep things as simple as possible. Building curves on top of curves will usually compound problems making them worse. You ca easily get lost doing that. Just because the software allows you to do something - it doesn't mean that you should.

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