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PPI vs DPI

Posted on 1998-08-06
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What is the difference between pixels per inch and dots per inch? I was told that setting 300 pixels/inch in Photoshop is not the same as 300 dpi in printing.
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Question by:ablab
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LOBO earned 100 total points
ID: 1116064
Here goes...

pixels per inch (PPI) is the resolution at which the image is displayed on a monitor, The more pixels per inch the higher the resolution and the larger the picture will appear.

Dots per Inch (DPI) is the resolution at which the image will be printed. in Photoshop, it is advisable to have your image at double the DPI at which you will be printing it. Eg for a job that will be played out to posistives at a screen ruling of 150 the image should be saved at a resolution of 300 DPI.
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Author Comment

by:ablab
ID: 1116065
That makes sense, but how do you save it at a resolution of xxx DPI? I only see that you can save it at xxx PPI.
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Expert Comment

by:LOBO
ID: 1116066
Sorry ablab,

I have made a small error. It is correct to say, DPI is used in printing and PPI is the resolution at which the image is displayed electronically. You are correct in saying there is no DPI Save setting in Photoshop.

The correct method is to save your image at double the Pixels per inch (PPI) to the dots per inch (DPI). Eg for a job that will be played out to positives at a screen ruling of 150 the image should be saved at a resolution of 300 PPI.

cheers
LOBO







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Author Comment

by:ablab
ID: 1116067
Thanks, LOBO
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