PDF version 1.7 by default?

[Zdenek Wagner]

so 8. 2. 2025 v 12:37 odesílatel Munehiro Yamamoto <munepixyz at gmail.com> napsal:
>
> 2025/2/8 8:05 Karl Berry <karl at freefriends.org>:
> > Does anyone know of specific practical compatibility problems that might
> > ensue if we switch to 1.7 by default? I know there can be problems "in
> > theory". But does anyone know of resulting problems in practice?
>
> Currently, I switch PDF 1.6 as the default when producing commercial books.
>
> At least, recent applications, such as Microsoft Word/PowerPoint,
> Apple Keynote, Adobe Illustrator and so on, output PDF 1.6.
> If a novice includes those output PDFs as an image and uses PDF 1.5
> (the current default PDF output),
> the image may not be visible on the PDF.
>
If a viewer understands PDF 1.6, you can insert 1.6 objects into a 1.5
PDF and it will work although a warning can be displayed. If the
viewer does not understand 1.6, then the result of upgrading the main
file to 1.6 would be that the viewer fails and probably shows nothing.
I do not know what are the possibilities of current viewers, I hope
that they understand 1.7 but press indastry might require older
versions. Anyway, PDF version can be downgraded by ghostscript.

> Best regards
> Munehiro
>
> Munehiro Yamamoto


Zdeněk Wagner
https://www.zdenek-wagner.eu/