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Re: "Convert to destination" for B&W ad?

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PDF/X-1a Adobe presets specify "Don't Include Profiles," so doesn't that mean that any profile attached to a photo in the ad would not be passed along to the printer?

Yes. You only need a profile if there needs to be an additional color conversion downstream. PDF/X-1a assumes you know the final destination and the values in the PDF are correct and should output unchanged—if you have a 50% black object on the page it will output as 50% to the black plate.

 

Starting with a photo that had no profile ("Do Not Color Manage This Document"),

Color always gets managed. If you don't assign a profile the Color Settings' current working space is used for conversions and display. In this case Do Not Color Manage means you are choosing not to assign a profile to the document.

 

then converting to the "Destination Space" of "Black Ink - U.S. Web Coated (SWOP) v2."

Converting (Edit>Convert to Profile) and assigning (Edit>Assign Profile) are distinctly different.

 

When you convert 2 things happen; the output (plate numbers) are adjusted to compensate for the new destination press conditions, and the new destination profile you converted to is assigned to the image. So with conversions you get adjusted plate numbers and the preview doesn't usually change because of the new profile assignment.

 

When you assign only one thing happens. The new assignment changes the preview displaying what will happen when you print the same plate values under the new press conditions. So changing the assignment from Dot Gain 20% to Dot Gain 30% darkens the preview showing you what to expect when the unchanged output values print with extra dot gain.

 

US Sheetfed Coated allows for more dot gain than US SWOP. If you make your conversion to US Sheetfed from Dot Gain 20% you'll see a bigger number change—30>23, 60>53, 90>93

 

I miss the days when I had definitive guidelines for the newspaper I produced (maximum 90% full black at the time, and maximum total CMYK percentage of 240%)

All that's handled by the profile when you convert from RGB to CMYK—US Newsprint SNAP has a 220% total ink limit, SWOP's is 300%. You have to make a conversion to get the limits, assigning SNAP to a SWOP image won't limit the ink, you have to convert.


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