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Deep black ink coverage: 300% or 340?

Hi everyone, I'm a newbie at my very first print project (colour Magazine).

Blurb's recommendation on rich black is 60-50-50-100. The sum is 260%. I assume that recommendation refers to large black graphic areas (a background, for example).

But what about black areas into the photos? (Like shadows or thick profiles.) When Photoshop converts from RGB to Blurb's CMYK profile, it translates deep blacks into a sum of around 340% (88-78-73-100).

But somewhere I've read that pigments sum should not exceed 300% for avoiding pigments overload, in fact both native Photoshop CMYK and SWOP Coated translate into 75-68-67-90 (300%).

So, my question: is it recommendable to keep ink coverage up to 300% even in Blurb anyway? Or does Blurb's ink coverage can actually (and “safely”) go up to 340% accordingly with their profile?

Thanks a lot in advance.


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I can see that you have already opened a ticket with your Customer service Team. Someone from that team can assist you further.

Mutuala M.
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I'm writing a publication about this right now. Now, I'll have to stop and look into this 280 max ink density. Off the top of my head, if they really do print at 280, it's possible that, if you have it set to 300, it will still print at 280. Will you see a difference, that is what my pub will be about. I'm testing the waters on black point and white point as part of my research. 

Mark Gilvey 1 voto
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