Resolution Print size at 300dpi Print size at 150dpi
6 megapixels 10×6.5inches 20×13inches
10 megapixels 13×8.5inches 26×17 inches
12 megapixels 14×9.5 inches 28 x 19 inches

A 300dpi image from 6 megapixels camera is only designed to print at a size of A4. The printing of a larger picture at high quality is possible by printing at a lower resolution, this is subject to the fact that the cameras produced a good quality image. Most image from digital cameras using a low ISO will be of high quality.