What are the best settings for digital artwork to be printed?

First you can do is use the forum search and read the many many many printing topics that people already asked.

https://krita-artists.org/search?q=print

And so on.

Long story short. Image size is your least concern. You basically enter the dimensions you want them to be printed on into Krita when you create the document and it converts it into pixels for you and you are set. But colors that is a whole other can of worms

What format is best depends but usually print shops want PNGs as they are lossless and can have color profile information, therefore are easy to handle for you and for them. While you work you use a kra file of course.

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