APub 2.3: Export to PDF/X-3 always converts image colour spaces

[k_au]

Coming out of this discussion I noticed that when exporting to PDF/X-3, the checkbox "convert image colour spaces" has no effect on the result. Image colours will always be converted, whether the box is checked or not.

Is this a bug or is this by design?

In case it's by design, could you make it clear what's going to happen with the colours? Maybe having the box checked and greyed-out (inactive) would show that this will always apply?
If you change the box, please also do the same with the PDF/X-1a option. Right now, the box is disabled but unchecked there, which is giving the wrong impression that there won't be any conversion applied.

BUT I'd rather this is a bug and it would be possible to have RGB images alongside CMYK in PDF/X-3 files. ☺️

 

[DWright]

I have logged this with our developers