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The dpi is the resolution of the image when printed, so both those sizes could still have a resolution of 300dpi. Do you have to print the image to enter it? Otherwise you could play around with resolution in your imaging software.
your pic is probably 72dpi (is the norm from a canon 400d or 350d which i assume is what you're using?) you will need to get into a programme like photoshop to change the image size.now if you change it to 300dpi you will consequently increase the image size so that will need to be reduced.I get images of 2930 x 1954 as pretty much standard on my 400d, and they are always 72 dpi.
If you use Irfanview you can change the DPI size really easily - open up a photo in Irfanview, click on 'Image', then 'Information', enter new DPI, click 'Change' then 'OK'.