Overprint / Transparency Question

Hi, all. I'm working on a logo which will need to be separated for 2-color offset printing.  To produce shading effects, I've created a solid black shape to which I've applied a black/white gradient as an opacity mask.  I've set this piece over an identical shape filled with a PMS blue.  The idea is to overprint the black ink as a solid-to-transparent gradient over the blue solid to produce the shading.  When I set the black gradient to "Overprint Fill" and view the logo in "Overprint Preview" the result looks great on screen.  The design also features a hard bevel, the dark edges of which are produced by placing semi-transparent shapes filled with black and also set to "Overprint Fill".
However, when I go to save the file I'm presented with a warning about how using spot colors with transparency can "generate unexpected results".  In the save dialog box there is also a message that says "Overprints will not be preserved in areas that interact with transparency".  What does all of this mean for my poor little logo when it goes to press?
Here's an example of what I'm trying to achieve.  The highlight is a simple gradient from white into the blue, but the shading is performed as outlined above.  Any insight would be appreciated.  Thanks!

The way I understand it is he is using a Black gradient over Blue.  The White can be White, but in this case, probably 0% Black will work.  The Opacity Mask is probably considered "Transparent" along with the Black bevel elements, hence the warnings.  I wonder if those elements can be left without transparency and set to "Overprint Fill".  For instance, a 30% Black on a single bevel element could be set to O.P. with no transparency settings.  There will be no screen view of the effect, but it will separate as a 30% Black overprint.  Same with the gradient.  It will not preview with the effect, but will separate as a Black gradient set to overprint ( no Opacity Mask necessary ).  Or, keep everything the same except apply "Multiply" in the transparency setting ( along with Overprint Fill in the Attributes dialog ).  This gives you the preview of the effect, but the nagging warnings.

Similar Messages

  • Overprint Preview question and another issue...

    Hi...
    CS4, Win XP.
    Overprint Preview question:
    The other day i sent a file for printing (poster) in PDF and CS2 formats. For some reason, the printer converted the file to a .tif and then printed. Parts dropped out... Both the PDF and CS2 files looked fine.Description follows:
    1/ Background black
    2/ Design element over the black (blue lines to form a wave).
    3/ Logo in red and white. Plus a line of text in red. And other text in white.
    The white of the logo vanished. The red line of text kind of vanished... printed very faintly and only (i think in parts). Printer tried to do a patch job of printing the line separately and pasting... anyway... to cut a long story short, he wanted the final output in .tif. OK...
    So, i converted to tif and sure enough... those parts vanished... did a search here and found the solution - view file in Overprint Preview and then in Attributes, turn off the Overprint Fill... so all well...
    So, the question is, why does this happen? And, how, do i know in advance that x or y is likely to cause a problem? I have noticed in Bridge that sometimes, parts of a logo or a line of text does not show... but looks fine in AI or Acrobat... now realise the cause, but not the reason.
    The other issue...
    Same black background(s)... placed Photoshop file/s with a transparent background... Prints fine at the printers (various machines and media) ... But on the laserprinter an HP Color Laser Jet CP1510 series, there's a dark patch around the image (the actual file area).
    Again, any ideas?
    Cheers...
    S

    PrepressPro1 wrote:
    <snipped>... so if your looking for this forum to play detective and tell you who in your workflow set the elements to overprint, I don't think this can be done. I don't think I have ever seen Illustrator set any elements to overprint all by its self. <snipped>
    Hi PrepressPro...
    Many thanks for your earlier inputs, but not quite sure where you got the idea that i want someone or anyone to play detective... i've understood the Overprint problem... and moved on. If anything, maybe i was just musing and wondering if any particular action turns on "Overprint Fill"...
    Or maybe, i was referring to the second question which has not been resolved yet... Quoting it below for easy reference:
    ++++
    The other issue...
    Same black background(s)... placed  Photoshop file/s with a transparent background... Prints fine at the  printers (various machines and media) ... But on the laserprinter an HP  Color Laser Jet CP1510 series, there's a dark patch around the image  (the actual file area).
    ++++
    To elaborate, the pix above are product shots which have been cut out and placed on a transparent background... The PS file is then placed in AI CS4 with the object option selected to maintain transparency. The transparent area is printing darker on the printer above. But is fine when sent to commerciqal printers...
    Attached is a scan of the problem...

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  • Another transparency question. CLARIFICATION NEEDED

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  • Powerpoint to pdf transparency question

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  • Spry transparency question

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  • Knockout with Transparency Question

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  • Overprinting/transparency issue I've never seen before

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    Hi
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      applied = true;
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      noise = 0;
      effectColor = "Paper";
      technique = 2020618338/*GlowTechnique.PRECISE*/;
      spread = 79;
      size = '0.125in';
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    I didn't apply object style to center oval, on purpose.
    Thankyou
    mg.

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