Well it's basically like this:

• Screen resolution is defined in pixels. Images are rendered in pixels also.
• Print resolution is defined in DPI, printers print out at certain DPI's.

So.. basically what the DPI does is tell your printer how smal your rendered pixels will be printed on paper. Which is why a higher dpi gives u a smaller print at the same pixel resolution then a lower dpi would do. For instance a magazine will require about 2500pixels wide or high for a print on one full page, but if you put the magazine page next to say, a 19 inch monitor the 1024 or more px on the monitors give roughly the same size image as the print in the magazine even though its less pixels.

DPI on computerscreens is a stupid invention once made by someone, i believe it was introduced somewhere in adobe photoshop once... and it's been confusing people ever since! I dunno who came up with the nosense really, a pixel is a pixel.

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