Cels Forum

Speaking of "dpi" for a picture displayed on a
screen is totaly meaning less ! How do you want to
measure the number of "dots per inch" when the size
of the dots change depending of the size/resolution
of a screen. This is a unit for printing.

Measure for a picture displayed on a screen is in
number of pixel. Common resolutions for a full screen
are :
640x480 pixel
800x600 pixel
1024x768 pixel

You probably don't want to use picture that need
more than the 800x600 resolution as most people won't
be able to display them fully on the screen.