Transparency on PDF v1.3

[Egis]

Hello All,

I have pdf file exported as 1.3 version (Acrobat DC shows this in file properties) that preflight still shows transparency eg it has not been flattened or not flattened correctly so I'm kind of thinking maybe it's not a real 1.3 version as to the best of my knowledge 1.3 did not support transparency? Am I wright?

Thanks in advance!

Egis

[Test Screen Name · Accepted solution]

You are correct. If the file contains live transparency but says it is PDF 1.3, the file is invalid. However, there is a good chance it will display as expected so only preflight ing will discover the error.

[Egis]

you are 100% correct - only preflight discovers the error and can fix it... but fixing 100s of pdfs manually every day is the task I'm not looking forward to be doing haha. Thanks!

[Test Screen Name]

There are automated preflight solutions to let you drop files into a check/fix folder for example. Products include those from Callas and Enfocus.

[Dov Isaacs]

Perhaps you can share with us what application generated the PDF file and whether it was further processed by some other application in some way prior to your checking for transparency (and the PDF version number)?

          - Dov

[Egis]

Thanks for your reply Dov,

pdf was created with Miles33, GN4 TeraPDFLib  app, then I would just check it with preflight and would find transparency highlighted even PDF properties says it's 1.3 Acrobat 4.

I'm onto developers to check if flattening is working properly.

Egis