just a couple of additional points...
all!!!! digital cameras produce a picture with some deviations from reallity. There is a program which adjusts the ready pictures on the PC with brightness, color setting etc...have a look for Xe847-Photo
Further, enlarging the picture size results in grains and pixellation, there is a nice program available which uses a couple of available interpolation routines and combines them to produce stunning big formats. I created a 2 x 3 mtr wallpaper with it and no one can spot the difference to any negative or slide reproduction...have a look for S-spline