100% Black converting to CMYK

[debrah67822962]

Hi,

When converting and InDesign document to PDF, I have the problem that all black elements convert to cmyk black instead of staying 100% black.

Can anyone tell me why, and how I can prevent it.

[kglad]

[moved from Adobe Creative Cloud to InDesign]

[rob day · Accepted solution]

Export using  the PDF/X-4 preset and measure the [Black] CMYK value in AcrobatPro‘s Output Preview.

[robersona23055745]

What is the difference between the X-4 and X-1A as it pertains to printing the jobs on newspapers?  Will these settings make a difference when it comes to quality of the print?

[Creamer Training]

Are you saying they are converting to a 4/C or multi-color CMYK black--for example: 60C, 40M, 40Y, 100K?

Or to a black-only CMYK black--0C, 0M, 0Y, 100K?

[debrah67822962]

Hi, IDEAS-Training.

It would convert 0|0|0|100 to a 4 colour black.

Using the PDF/X-4 maintains the single colour, although it still indicated Overprint.

[rudo123]

Be sure in Edit -> Transparency Blend Space you have "Document CMYK" choosen, not "Document RGB".

[rob day]

A feature of the default PDF/X-4 preset is CMYK black (0|0|0|100) will export unchanged even when the blend space is set to RGB.

PDF/X-1a, which flattens transparency, would convert black only to a 4-color mix if there’s any transparency on the spread or page.

[debrah67822962]

Thank you Rob Day,

This worked. But, can you tell me - why does it still show the black as being overprint?

And, I don't have Acrobat Pro - is it included in CC?

[rob day]

Unless you change the Appearance of Black preference, the [Black] swatch always overprints.

You would never want small text on a colored background to knockout. For large areas of black make a new black or rich black swatch. new swatches knockout unless you check Overptint in the Attributes panel

AcrobatPro should be included in your subscription. Its Output Preview lets you check output values and object color modes.