Saturday, July 30, 2011

What the press operator is scrutinizing

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4 comments:

  1. Your first comment on mis-registration is a little misleading since there are RIPs that render open-center and closed-center rosettes.

    Great work Gordo....

    Let's collaborate on content together and get you off a subdomain!

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  2. @Rick - Well, maybe not misleading but rather incomplete since I didn't want to get too complicated. Most RIPs offer the user the choice of clear or dot-centered rosettes. My assumption for this post is that the normal rosette pattern for this printer is clear-centered. Which, for good reason, is true for the vast majority of printing. So if it's normally clear-centered and now it's dot centered then it's out of register. Of course if it should be dot-centered and now it's clear then, again it's out of register.
    The only application that I'm aware of the benefits from dot-centered rosettes is screen printing or very very coarse AM screens.
    A well designed AM screen will maintain a clear-centered (or dot-centered) rosette over the longest diagonal distance of the media that the RIP will be expected to expose.
    However, if the AM screen is not optimal then you'll have a problem called "rosette drift" where the rosette drifts from clear-centered to dot-centered and back again over a few inches. If that's the case then checking rosettes for misregistration doesn't work.
    I just didn't want to drill down that deeply in a caption LOL.

    Thanks for your comment! - gordo

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  3. I'd be very interested in a similar investigation of digital printing

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  4. @Jim

    With digital printing the press operator is likely scrutinizing his unemployment benefits application form.

    :-(

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