u/Sufficient_State_412

Full disclosure: I'm an amateur when it comes to color management as I'm constantly learning as much as I can right now. I'm having fun learning!

I have a large format printer that I use for a side gig printing people's artwork. I receive scanned artwork files and people's phone pictures of their artwork.

I sell loose prints on 3 different paper types that I have downloaded their ICC profiles into the destination spaces in Photoshop and Professional Print & Layout for the Canon printer I have.

So far no one has sent me files that have embedded color profiles... until today. I printed two versions of their file: one using their embedded color profile and the other using the ICC profile I typically use for this same order type (same paper, same printer, same workflow, etc.)

When I use my workflow, the prints match my display as they typically would since I calibrate it using a colorimeter.

This time, the print of the file using their embedded profile, is not matching my display.

So as I'm thinking through what I THINK I understand haha, the purpose of color profiles and working spaces are for different devices to execute the same colors within the gamut that they can maintain/provide/display/print/etc.

So is it safe to assume that if I print their file without converting their embedded profile into my RGB working space/destination space, that it will print accurately to what they see on their monitor?

Would someone be willing to explain why a file with large dimensions and 72 PPI would look better than a file with small dimensions and 600 PPI?

Should I use my customer's embedded color profile sent in through my online shop?