NOTE: If you would like to be considered, your photo submission MUST be a JPEG file no smaller than 3" x 5", with a resolution of no less than 300 DPI.
The question I have is about the 300 DPI bit.
When I check the details of my picture, it says that both the Horizontal Resolution and Vertical Resolution are 180. Is that enough? If not, how do I raise that to above 300?