The statement that If your camera uses a 4:3 aspect ratio, but you want a 4 x 6 (3:2) print, many megapixels are wasted (11%) is; True
The print size calculations usually assumes that the camera's aspect ratio which is simply defined as the ratio of longest to shortest dimension, is the standard 3:2 used for 35 mm cameras. Thus, most compact cameras, monitors and TV screens have an aspect ratio of 4:3, while most digital SLR cameras have aspect ratios of 3:2. Many other types exist though: some high end film equipment even use a 1:1 square image, and DVD movies are an elongated 16:9 ratio.
Thus, we can say that if your camera uses a 4:3 aspect ratio, but you need a 4 x 6 inch (3:2) print, then some of your megapixels will be wasted (11%). This should be considered if your camera has a different ratio than the desired print dimensions.
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