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Many cameras will take pictures at only 72 dpi. Changing the resolution causes the camera to change the size of the picture in terms of pixel dimension (ie 800x600 vs 640x480) but always at 72 dots per inch. A photo editing program like Photoshop can change the resolution to whatever you need.
Image Size: 2272x1704 / 1600x1200 / 1280x960 / 640x480
Econ : 570KB/390KB/300KB/160KB
Std : 1050KB/660KB/620KB/240KB
Fine : 2100KB/1050KB/680KB/320KB
640x480 Fine: 750KB/s
640x480 Standard : 500KB/s
320x240 Stanadrd : 230KB/s
640x480 Fine : 1500KB/s
640x480 Standard : 1000KB/s
320x240 Standard : 450KB/s
Since the image size may vary depending on scenes, subjects, and storage media, these are approximate values only.
lets start with resolution. 640x480@ 72dpi is 8.8in X 6.6in when you change that to your printer resloution (300 dpi) it becomes a 2.1inX1.6 in print. if you want a 4x5 image @300 dpi shoot the TIF 1200x1600 (actually it is a 1200X1500 for 4x5 proportion)