Wednesday, October 28, 2009

Choosing the right screen angle for over-printing spot colors

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3 comments:

  1. Gordo, I can appreciate this article...the RIPs we use calculate the correct angle to place additional spot colors on, so it's a breeze!
    Thanks

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  2. Gordo, do you have any comments on how the screen angle of a spot color incorporated into a 4/c image affects the color of the piece on press? - assuming am screening
    -Dan

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  3. If the "missing" color screen angle is used (e.g. the cyan angle for a spot orange) then I don't believe the screen angle will effect the color.

    However, if the spot overprints a color (e.g. spot orange over Magenta or Yellow) then you'll likely see problems on press. Dot on dot printing will reduce the potential gamut, you'll likely see color shifts with slight misregistration, and you might also see lines form in flat tone areas as dots chain up with slight misregistration.

    I say "might" because seeing artifacts in the presswork will depends on the image content and size of the image area. For example, if the 4/C image to be overprinted has lots of image detail - then you may not see a problem. If the image contains large flat screen tint areas then you likely will have an issue.

    Hope that helps.

    - gordo

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