SOURCE: setting dpi on my nikon d3100
DPI (dots per inch) is an output specification and is irrelevant to the camera. The camera puts a value into the field simply because it has to put something there. The DPI is set by the printing program when it prints a picture. A picture printed at 4x6 will obviously have more dots per inch than the same picture printed at 8x10.
Posted on Nov 30, 2012
Hello, try to factory reset it, if still does not work and you will need to disassembly your nikon d3100 and change any parts i had found a official service manual that it will help, ypu can download it from the below link:http://goo.gl/AvZHV
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