Is really Pdf/A?

Discussions about PDF management.
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Is really Pdf/A?

Post by fierikit » Mon Sep 07, 2020 6:59 pm

take a normal Pdf (Not Pdf/A but PDF1_4), size 381KB
1) using ConvertToPDFA the new file size is 2436KB
2) using my cheat (*) the new file size is 396KB
For both new files GetPDFAConformance says: PDF_A_1b
question: can be true also for the second file?

cheat (*)
a) create e new and empty Pdf/A
b) Merge a) with a normal Pdf
c) Delete first page
d) voila!

P.S.: cannot attach file 1) cause is too big
(380.45 KiB) Downloaded 191 times

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Re: Is really Pdf/A?

Post by Fabio » Tue Sep 08, 2020 10:19 am

Hi there,

Using the MergeDocument method, if the first PDF document in the list (stored in the first GdPicturePDF object in the input parameter) is PDF/A compliant, the resulting document will also be PDF/A compliant. The conformance level and version of the merged document will be PDF/A-1b regardless of the original conformance of the first source document.

PDF/A format is a PDF with restrictions in it metadata's definition to ensure the portability/integrety of it.
So yes, it should be true!

Here's the PDF/A restrictions:
- ignore any data that are not described by the PDF and PDF/A standards;
- ignore any linearization information provided by the file;
- only use the embedded fonts (rather than any locally available, substituted or simulated fonts);
- only display using the embedded colour profile;
- ensure that form fields do not change the rendered presentation and are rendered without regard to the form data;
- ensure that annotations are rendered consistently.

Hope it helps!

Fabio de Rose
Solution Engineer

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Re: Is really Pdf/A?

Post by fierikit » Wed Sep 09, 2020 9:17 am

OK, thanks
but how is possibile that two different ways for having a Pdf/A-1b from the same Pdf document create two Pdf/A-1b so different in size?
for us is absolutely important because we need to send to an important service only Pdf/A-1b

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Re: Is really Pdf/A?

Post by visaroe » Fri Mar 17, 2023 4:01 am

Firstly, PDFs may be enormous if one or more typefaces have been embedded and subset inside that particular PDF file. In fact, adding a single typeface to a PDF documenthappy wheels game may significantly increase the file size. Second, photos may be a problem.

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