Effects Boxes in PDF viewed in browser

For clients that can't be relied on to use Acrobat Reader for reviewing PDFs I provide a flattened sRGB PDF proof with Overprint Simulation turned on, which gets around a browser's color management and transparency shortcomings.

So below would convert GRACol CMYK color to sRGB without a change in color appearance. If the browser isn't capable of color managing via embedded profiles it will likely default to sRGB. The Acrobat 4 flattening would take care of a browser's problems rendering live transparency. If the spot colors are creating a problem you could convert them to process via Ink Manager.

You could also flatten and convert to sRGB out of AcrobatPro.

Even if your clients are always viewing in Reader, screen proofing would be unreliable as a contract proof. There are still Acrobat preferences that could change the view, not to mention bad monitor profiling on the client side.

It is still there ( didn't include screenshot of it ), even when I saved out PDF with High Res Transparency flattening as PDF/X4 and did not go thru Kodak Prinergy. Just out of InDesign CC2018, OSX  10.13,5. The File has only one Profile and thats Gracol G7, which we are certified! The boxes don't show up in Acrobat Pro and I wish I could tell my Clients not to use anything else but Acrobat with overprint preview selected, to review their files. My life would be a lot easier. Like i always say, its easy when you know it.

Hi Karl-Heinz,

did you export to PDF/X-4 before the PDF went through the Prinergy workflow?

Do the "boxes" show up if you open the refinded PDF with Adobe Reader or Acrobat Pro?
If so use the object inspector and see what color profiles are in place for the different parts of the image.

And ask Kodak why this happens.

Regards,
Uwe

Stop using a browser for proofing a PDF and stop using X/1-a which is what this looks like.

Acrobat and Acrobat Reader with PDF/X-4 is the most reliable combination.