Are you "betting your life" that my 1500 x 2100 px for a 5 x 7 inch photo, printed from Photoshop, assigned 30 ppi instead of 300 ppi (resampling left unchecked), will in any case print visibly worse instead of the expected quality...? What I want to hear is that you must use this field when printing (which you guys do seem to do, which is what I used to think in the past, but now is "new" to me after seeing so many say it's pixel dimensions that matter, making sense to me). By @Zesty_wanderlust15A7 As far as Photoshop itself is concerned, this is like asking: Are you "betting your life" that a yard is 36 inches? The answer is yes. The PS document is 1500x2100, and the resolution tag is meaningless at this point. You can have a printer produce 1500 dots per inch and end up with a print that is now 1 inch in that dimension. You can have a printer produce 500 dots per inch and end up with a print that is now 3 inches in that dimension. You can have a printer produce 100 dots per inch and end up with a print that is now 15 inches in that dimension. All may (will) visually differ! Yet the document is and always was 1500x2100 pixels. No matter the tag. HOW you* divide up the pixels to produce a dot; that matters. * You setting the print driver and set 'size' for output, as the Jeff Schewe article explains.
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