What is the difference in the picture quality between a 2.0 and a 2.2 megapixel digital camera?
by 
Smitty921
ANSWERS: 2
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The difference between 2.0 and 2.2 megapixel is very small. The Megapixels only tell you how high a resolution pics the camera takes, and 2 MegaPixel is around 1600x1200 pixels. High-end cameras today are around 6 to 8 MegaPixel, and 3 MegaPixel cameras are getting cheap. So the difference here is minimal. Generally speaking, more MegaPixels should equal higher picture quality, but there are several other factors that are important - such as the quality of the lens. So if you're choosing from a 2.0 and a 2.2 MegaPixel camera, you should focus more on other aspects of the cameras: Do you like them? As in: Do they have the features you need, do they feel nice to use, etc.
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There is, effectively, no difference, except that the manufacturers can try to sell you something 'better'. There is little change in image quality even when you increase from, say 2 to 3 megapixels. A 2 MP camera would have a nominal image size of 1600 x 1200 pixels (4:3 format). A 3 Mp camera with the same image ratio would be 2000 x 1500, a linear increase in the number of pixels in any one dimension of about 25%. Also of significant importance and rarely discussed by manufacturers is the size of the image sensor. As a general rule of thumb, the larger the sensor the better the image quality. Many digital cameras use a sensor which is about 2/3 the size of a frame of 35mm film. Some use smaller ones - lower cost, but also lower quality. A 5 MP camera with a small sensor would generally produce poorer images than a 4 MP camera with a larger sensor. Chasing megapixels sells cameras.
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