Thank you for so quick replies!
The best settings you'd want for printing photo/fine art is have the software manage colors (Photoshop) and make sure to turn the color management off in the printer settings so you don't have double profiling happen, have Black Point Compensation checked and choose Relative Colormetric.
I'm afraid I don't get all of that info. Should I not use Canons Plugin in PS (File -> Automate -> Canon Professional Print&Layout)?
Only if I use the print function within PS, I can select options that you mentioned, if I go into CPP&L, I can't find a place where I would select what controls colors.
If you scanned the image into the computer, the resolution may not be the greatest unfortunately, due to the way a low quality scanner can offer. Doesn't mean it will scan terrible, but it depends on the functionality of the scanner.
Input file was scanned years ago on some big format OCE scanner - cant remember the name, but I think it was something with 4k in name. Input file looks great in PS, quality should be ok.
I wrote about low quality of scan for my output example - this one I made on my home scanner, just to show what dot pattern I am worried about.
Hopefully that will work with those suggested settings. These are recommended by our color specialist for best print output.
I will try to follow those instructions, will see how it goes.
I'm not aware of a visible dot pattern.
That's what I was expecting there, to not have visible dots all over paper :/
I never print at 600 dpi. I nearly always print from LR at 300dpi; always use Highest Quality in the Canon driver, and print on a range of papers including Canson Baryta. For that paper I use a Custom Paper Preset that I made, and with a custom ICC profile. The results, again to my eyes and to other trained eyes, look really good.
I had the same effect with other artwork I printed, and the source was in 300dpi :/
I didn't create my own icc profile, since Im waiting on delivery of all media (its very long waiting time there where I live) and all I had to use was sample pack.
Might I suggest cropping a small area of your image and printing that at 300? I'd be happy to make a small print of your image with our 4000 and send you a scan of that print.
I will try to crop it to some manageable size
Just in case that it changes anything, I'm currently on OSX Mojave