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| p.1 #3 · ACR default DPI... why 240? |
ACR's defaults are sticky. Change it once, it's changed until you change it again.
That being said, the answer to your question is "Depends, test it in your workflow and with your eyes." Maybe you'll see a difference, maybe you won't. In general, any perceptible difference will be so minor as not to matter. It tends to matter more in wet lab workflows than inkjet workflows.