DPI is related to printing as mentioned. 600DPI is considered professional and 300DPI is standard.

72DPI is okay from printing up to A4. As Akpe says you can still print as big as you like really in 300DPI which is a better and higher quality print but if you're going to print A1 size prints you will notice the quality loss on 72 or 300 DPI.

Don't worry Kai. I also print on 300DPI bigger than A4 and as Akpe says the quality loss is not noticable...

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