What size print can I make with a 8 megapixel camera? If I print in high resolution (300dpi) and low resolution (72dpi). There is any formula to do that transformation from megapixel to inch?
First, all 8 megapixel cameras are not created equal. You need to start by finding the actual number of pixels in each dimension of the image for your camera. I looked up the Nikon Coolpix 8700, which is an 8 megapixel camera. and found that the images are 3264 x 2448 pixels. If you multiply those two numbers together you will get the total number of pixels in the image, which is just under 8 million pixels (8 megapixels) in this case. Other 8 megapixel cameras might have slightly different numbers. Then to find the print size for a given print addressibility, you just need to divide the number of pixels in each dimension of the image by the pixels per inch on the print. So at 300 dpi, this camera would make images that are about 10.9 x 8.2 inches. At 72 dpi, it would be 45 x 34 inches, and so on. I like to use 200 dpi as a rule of thumb for print quality equivalent to typical analog photographic processes without visible artifacts on the print. This camera would allow you to print 16.
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