You can print a beautiful 8 x 10 quality print from and image recorded at 1127 x 1704 (4 megapixels) or larger. These photos are quite suitable for framing and display, or even for the cover of a well-known magazine. Being close to the action will even allow you to crop the image and still have quality resolution for a good-sized print.
However, if you want a picture the size of a credit card, use 640 x 480 resolutions, no posters, and not what you want on display at your first showing, but great for camera phones!
If you have a massive enough memory card, there is no reason to shoot at low resolution and chance missing a really great shot! It also allows you to show off your work in a very big way, which should always be a consideration.
When buying your camera, don't fall into the notion that more megapixels are necessarily better; all pixels are not created equal. When items go digital, everyone believes that smaller is better.
But think about this -- pixels used in digital camera sensors are used to record the light in your photos, so doesn't it make sense that larger pixels will record better light?
Carrying this on to its final conclusion, they would also create a better quality digital image. The ability to miniaturize items has led to scientists squeezing more pixels onto an imaging sensor, so they are smaller. What this means is that the sensor is smaller, but the number of pixels stays the same.
The small sensor may be more efficient due to the smaller size; this does not mean it will produce better photos, than larger pixels on a larger sensor. Check the size of the sensor when you are thinking about purchasing a new digital camera.
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