Originally posted by jct us101 6 megapixels is plenty.
Not really. Let's have some maths..
My Samsung thermal photo printer has a native resolution of 300 dpi, it is designed to print 4R photos. Suppose it can print in larger size, with a 6MP source picture, how large *should* it be printed?
6MP = 3000 x 2000 (but not true resolution owing to the Bayler's artifacts and other imperfection like jpeg loss and optical aberrations etc.)
Even assuming it has the "perfect" resolution in 3000 x 2000, you can get only 10" x 6.7" print at most. In reality, a 14.6MP K20D could produce *optimal* resolution of around 2,400 dots per picture height in real measurements (by various reviewers) which just means that at a standard 300 dpi printing resolution, it should not print more than 8" for a picture before "inadequacy" in resolution can be seen! So, if it is just 6M..?