I have just become confused about image resolution. Seems like most ppl, myself included are confused about what resolution means. So hopefully somebody can clear it up. For example, - my old Canon S400 takes photos at a max "resolution" of 2272x1704 (4MP). - my new Casio Ex-z60 takes photos at a max "resolution" of 2816x2112(6MP). but I think those numbers are actually the size of the image. As a 4MP image can be printed on an A4 paper at full quality. (i've always maintained that most of the users don't need anything more and 4MP) I think resolution of a picture is the pixels/inch that the camera can capture. This is probably the most important specification that the manufacturers do NOT advertise. When i was in school, we learned that having more points on a graph is just as important as the size of the graph, since it will show more detail of what is actually happening. And i think this is the case here. However, now i'm confused. what do the measurements of 2816x2112(6MP) actually stand for? since those are commonly referred to as XXXXpixels x YYYYpixels, and somehow converted to length in inches or cm. I think i've confused myself as to how all this works. my S400 is 2272x1704, and has a resolution of 180pixel/in. my ex60 is 2816x2112, and has a resolution of 74pixel/in. which results in the canon taking SMALLER, but CLEARER pictures. oh, might I add that changing the quality of the image from fine, normal, economy, etc. on these cameras do not seem to add any pixels/inch. then what does it add?