DPI in Photoshop

markimage

markimage

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I am using the L setting in camera to give the highest resolution, but when I look at Image Size in Photoshop it shows 72 Pixels/Inch.
I would have thought this should be greater?
 
That's the nominal resolution to establish a physical print size (in inches).

The size setting on your camera will not change it. What that changes is the pixel dimension of the image in the same dialog in Photoshop - e.g. 3000 x 4000.
 
Musicman said:
That's the nominal resolution to establish a physical print size (in inches).

The size setting on your camera will not change it. What that changes is the pixel dimension of the image in the same dialog in Photoshop - e.g. 3000 x 4000.
Click to expand...

Thank you. Should I increase the 72 Pixels/inch for printing? How does Pixels/Inch relate to DPI?
 
markimage said:
Thank you. Should I increase the 72 Pixels/inch for printing? How does Pixels/Inch relate to DPI?
Click to expand...
DPI = dots per inch and is what the printer specifies. Most printers (physical devices as opposed to shops you walk into) operate at 300 dpi or higher. PPI is the number of pixels used to produce an inch of print.

Say you have a printer that prints at 300 dpi, and you want a 10" print, that means it will be 3000 dots along that edge. You now have a 300 pixel image and print it, it will be printed at 300dpi, but 30ppi (each pixel will cover 10 dots). If you have a 3000 pixel image, it will be at 300dpi, 300ppi, if you have a 30000pixel image, it will be 300dpi, 3000ppi (10 pixels are used to generate 1 dot).

They are independent values, but tend to be used interchangeably. If I print out, I get it so my ppi = printer dpi (i.e. in the above example, I would have sized my image to be 3000 pixels along the edge).
 
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