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#1 biferi

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Posted 13 December 2015 - 02:56 PM

I have an 8.0 MP Camara and it takes good photos.
 
Now when I crop a photo I know I am changing the size this is ok.
 
But before I save it I always check the Properties of the photo.
 
And for the RES. it says 72 should I leave it as is?
 
I know Camaras take photos at 72 DPI but I never understand why?

Edited by Orange Blossom, 13 December 2015 - 02:59 PM.
Moved to more appropriate forum. ~ OB


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#2 Chris Cosgrove

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Posted 13 December 2015 - 06:55 PM

This figure you are seeing for resolution is only for printing purposes, where you would almost certainly want to change it. The actual resolution of your camera image is w x h pixcels. A quick look at one of mine shows 4288 x 2848 pixcels.

 

So if I was to print that on a sheet of A4, in landscape mode and borderless, I would be printing at a resolution of approximately 350 pixcels ( or dots) per inch. If I printed it at 72 dpi I would have a picture approximately 60 x 39 inches !

 

To put it another way, at the 350 dpi level I would have quite a nice glossy image, at 72 dpi it would be much larger but the quality would only be about that of a photo in a newspaper. Cropping an image reduces the size of the image but it doesn't itself change the resolution.

 

Chris Cosgrove


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