App + backend + date/time metadata is not written to the resulting PDF files

[nekohayo]

When you open a PDF with GNOME Papers, you can see its metadata in the document's properties. This is what you get with PDFs made by GNOME's Simple Scan or Adobe Scan:

Simple Scan	Adobe Scan

FairScan 0.16's PDFs have none of the "Content" (Producer, Creator) and "Date & Time" metadata fields filled.

[pynicolas]

@nekohayo Thanks for the suggestion!

I pushed 1ad586e which feeds:

• creation date/time
• creator

I'm unsure about "producer", so I prefer to leave it aside.

[nekohayo]

For your curiosity, I wondered about the same thing a long time ago too, and I had looked up this thread where someone explained it thusly:

According to the PDF reference both should be set if a PDF is created by converting from another format. Then creator is the application which created the original document and producer the converter. E.g. if you convert from docx the Creator would be e.g. Word XY, and the producer for example some print to pdf driver.

If you create the PDF by using LaTeX together with some dvi-driver, then the creator is typically some variant of LaTeX and the producer e.g. xdvipdfmx or Ghostscript (which sets the producer automatically, you can't adjust this in the document).

It isn't quite clear if one should call a PDF creation with pdftex or luatex a conversion, but creator is here normally set to variant of LaTeX too, and the producer to the engine and its version.

If you create a PDF with Acrobat, it will set both to the name and version of the application: Adobe Acrobat XY

[alerque]

The Exif meta data in JPEG exports could also include this info.