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17,183 Views 7 Replies Last post: Feb 24, 2011 7:14 PM by troffer RSS
Level 0 4 posts since
Feb 17, 2011
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Feb 23, 2011 1:26 PM

Rich black turns gray on pdf export?

As there is no specific export setting mentioned and various recomendations I have tried them all. In every case I have found that rich black exports to a dark gray in pdf. Anyone notice or know anything about this? Will the cover print in rich black with CMYK all 0s? even if the pdf looks gray? thank you

Level 5 12,993 posts since
Aug 22, 2008
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1. Feb 23, 2011 1:50 PM in response to: EssenSieMich
Re: Rich black turns gray on pdf export?

Welcome to the community. 

 

Export using the PDF/X-1a:2001 preset.  If you still seem to have problems with the output, you might upload the PDF to the Preview Gellery and provide a public link to it here so others can see what you're seeing.

 

Hope that helps.  Best wishes.

Level 3 609 posts since
Sep 24, 2009
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2. Feb 23, 2011 6:59 PM in response to: EssenSieMich
Re: Rich black turns gray on pdf export?

My guess is that somewhere in your process CMYK(100, 100, 100, 100) is being converted to CMYK(0, 0, 0, 100).  The latter will be displayed on an RGB monitor as a dark gray.

 

CMYK (100, 100, 100, 100) corresponds to 400% ink coverage, which is a lot of ink.  240-250% coverage is more normal.  The LSI recommendation for rich black is CMYK (60, 40, 40, 100) = 240% coverage, with an additional recommendation not to exceed 240%. I'd assume CS's process is similar.

Level 3 609 posts since
Sep 24, 2009
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4. Feb 23, 2011 8:40 PM in response to: EssenSieMich
Re: Rich black turns gray on pdf export?

CMYK(0, 0, 0, 100) "should" put down black with 100% coverage, but not any of the other colors that would make it a rich black (darker and with a little color).  So if a rich black is what you want, you will probably have to specify it that way.  I'll have to defer to an InDesign user for particulars on that application, though, because I've never used it.

 

The reason I put "should" in quotes is because last summer I ran into a problem on a cover where text that was defined as process black (the standard for black text) was apparently being screened, and it looked awful.  The slight color misregistration that occurs with rich black was actually less annoying than the screen.

Level 3 609 posts since
Sep 24, 2009
Currently Being Moderated
7. Feb 24, 2011 7:14 PM in response to: EssenSieMich
Re: Rich black turns gray on pdf export?

Glad that worked out.

 

I probably added some confusion by mentioning text, but I was referring to black text on the cover.  As you noted, b/w interiors print black only and use DeviceGray color space.

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