Lets say the 4mp camera someone might have is a 4:3 ratio but they were wondering how much more resolution the 8mp camera would have compared to it. But wait, the 8mp is a 3:2 aspect ratio. How much overall resolution gain would there be? What about vertical and horizontal gain? How much larger would it print?

If 8 mps has 2 times as many pixels as 4 mps would it print twice as large? Would it have twice the resoultion? These are things that I notice people thinking so I thought I would help them out. Here is the results from using the calculator with the above example (camera #1 is 4mp and camera #2 is 8mp):

Approximate Image Size:

Camera #1 ~ 2309 x 1732

Camera #2 ~ 3464 x 2309 (2x the pixels of camera #1)

Resolution Gain:

Camera #2 has 41.4% more overall resolution than camera #1

Camera #2 has 50% more horizontal resolution than camera #1

Camera #2 has 33.3% more vertical resolution than camera #1

What does this mean?

At 300PPI the two cameras would make the following 3:2 and 4:3 sizes:

Camera #2 would print at 7.7" x 11.55" whereas Camera #1 at 5.13" x 7.7"

Camera #2 would print at 7.7" x 10.26" whereas Camera #1 at 5.77" x 7.7"

**Please note**that this comparison assumes that image quality (lens quality, noise, etc) is comparable for both cameras.

Hope this is useful to you guys. Enjoy!