Grayscale image gets converted to RGB when saved with default PDF/X-1a settings

New Here ,
Jan 05, 2021 Jan 05, 2021

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I must be missing something really simple as I can't figure out why a grayscale image gets converted to RGB when the page is saved as a PDF/X-1a PDF. I am using InDesign CC 2019 and the default PDF/X-1a settings that come with it.

 

On the left the original image and on the right the same image opened from inside the newly created PDF.

Screenshot 2021-01-05 at 14.14.56.png

 

What am I doing wrong?

 

Thanks,

-kimmo

 

TOPICS
How to, Import and export, Print

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correct answers 1 Correct Answer

Adobe Community Professional , Jan 05, 2021 Jan 05, 2021
The PDF/X-1a standard doesn’t allow RGB images—all process color gets converted to CMYK and grayscale images are put on the CMYK black plate. A conversion is happening when you open the image into Photoshop.   Rather than checking the image in Photoshop, use AcrobatPro’s Output Preview>Object Inspector, or Preflight to check the image’s color mode. Here I’m running a List Page Objects preflight, which shows the image is a grayscale:  

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Adobe Community Professional ,
Jan 05, 2021 Jan 05, 2021

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The PDF/X-1a standard doesn’t allow RGB images—all process color gets converted to CMYK and grayscale images are put on the CMYK black plate. A conversion is happening when you open the image into Photoshop.

 

Rather than checking the image in Photoshop, use AcrobatPro’s Output Preview>Object Inspector, or Preflight to check the image’s color mode. Here I’m running a List Page Objects preflight, which shows the image is a grayscale:

 

Screen Shot 5.pngScreen Shot 4.png

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New Here ,
Jan 05, 2021 Jan 05, 2021

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Thanks Rob for explaining why it behaves the way it does and showing me a right way to check it!

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