I think 10MP would be lots for 8x10 and 16x20. However I'm pretty sure when it comes to these compact cameras pixels means very little as the sensor size never increases and sometimes even gets smaller. Typically the density increases and from my understanding is that rarely means much more than a number used for marketing. It's why you can look at full frame cameras which have large sensors yet usually only around 12MP while the latest and greatest tiny compact has 25MP on a sensor a fraction of the size.
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