Sure you can change it. Just go to image size in your photo software and change it to 300dpi Its what all the professional printing companies suggest you do before you print any of your images. Just do a save as to a tiff file for best resolults If you keep making changes and save over and over again to a jpg file you loose a lot of your quality. changing to 300 dpi doesnt make your image smaller. I printed some of mine for and art show at 300dpi at 11x16 and the people who saw them on display said they were truely amazed that my work had come from a digital camera. I dont remember what mpx your C2040is, I just remember when I owned a C3030 it took pics at 3.4 mpx. which I couldnt print past 8x10, now I have 6.1 mpx
The short answer is you cannot! I believe the resolution of your camera is 1600 x 1200 pixels; if you print this out @ 300dpi. you will get a print size of 5.3 x 4 inches. if you print at 72 dpi the print size will be 22 x16 ins. The 72 ppi that is recorded with your exif data is meaningless.
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