4 Correct answers
@Trendssoul unless you're going to print your images, there's no need to change the DPI, if you do want to change it you can do that from the Image > Image Size menu
https://www.adobe.com/uk/creativecloud/photography/discover/dots-per-inch-dpi-resolution.html
I hadn't seen that link before, @Ged_Traynor , but I like that it first correctly defines DPI and only later explains the difference between PPI and DPI!
What does DPI stand for?
DPI stands for Dots per Inch, referring to the number of ink droplets a printer will produce per inch while printing an image. The more dots of ink per inch the picture has, the more detail you will see when printed.
How does DPI differ from PPI?
PPI (Pixels per Inch) refers to the number of pixels that make up ever
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Except that some of the information in that article is wrong /misleading.
Pixels per inch ppi is used for printing. An Epson inkjet for example may print an image at 300 pixels per inch. However those pixels are themselves made up of dots and those could could be laid down on the paper at 2880 x 1440 dots per inch or 1440 x 720 dots per inch. So less dots per inch but the same number (300) of pixels per inch.
If you are making images for screen ppi is irrelevant - the screen on which it is
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There is zero difference in a document that is 1000x1000 pixels (as an example) at 72 dpi (PPI) or 300 dpi (PPI) or any such value. All are 1000x1000 pixels and the dpi/ppi is simply a metadata tag.
This very, very old primer on resolution still seems necessary to post, this may help in understanding this tag:
http://digitaldog.net/files/Resolution.pdf
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Replies
You do realise that when you set 10% scale in the print driver you are resampling. Just in the driver not in Photoshop - so with no preview.
Dave
By @davescm
AND as the Jeff Schewe article outlines, depending on factors we can't control, resampling (in driver/OS) in a far less than optimal way.
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 @Signfeld
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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