Hi @thomaso
Many thanks for your extensive work on that!
As I wrote you these are not original picture files (I should have them next week) but ones saved from pdf by Publisher.
I really appreciate your help with that and I will certainly take a look at Preview alternatives. The good thing is that Publisher exports my file to pdf without any problems and no, due to situation we are all facing, I work mostly with pdf and emails. When it's over I will have much better brochures prepared and they will be ready for printing.
Again - thanks for taking so much time to examine this issue. I know more and I'm pretty sure I know what to do next.
Also, when I have high quality pictures (next week) I will make some changes in the original file (replacing all photos) and will see how it works. But, judging from what you have written above, I do not expect Preview.app to work
Have a great weekend and Happy Easter!
Witek