[wulf]

Changing the dpi does not affect the quality of the image. All you are doing is changing how small you are asking your printer to print the dots. Within the limits of the printer, smaller dots means a picture you can look at more closely and be fooled into thinking the colours are smooth but at the cost of the final image being smaller.

I am not sure if you can change the dpi output by a camera but it is an easy job in most photo-editing software. However, while the dpi does affect the size and visual quality of the output, it has no effect on the quality of the photo nor what you see on screen (where the number of "dots per inch" depends on your screen size and display resolution).

Wulf