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Earthbound Light has a good tip article explaining 'DPI - or Dots per Inches'. Here's how the tip starts:
'When you open image files from your digital camera, are they 240dpi, or are they 300dpi? Or perhaps only 72dpi? If you open them in a different program, does the resolution change? This can happen, but that doesn't mean that anything is wrong. After all, resolution is just a number. And it can be changed.
Allow me to explain.
The sensor in my Nikon D2x measures approximately one inch by two-thirds of an inch (23.7 x 15.7 mm). Full sized D2x images are 4288 x 2848 pixels. If I were to print an image at the size it was captured, I would end up with a mighty fine, inch by two-thirds of an inch print with an extremely high resolution, limited only by what my printer is actually capable of printing. If I were trying to make my own postage stamps, prints this size might be of interest, but larger ones are likely to be more in demand otherwise. Those same 4288 x 2848 pixels could also be printed more realistically at 300dpi to yield a print approximately 14 by 9.5 inches. Or at 240dpi for an 18 by 12 inche print. Or a gigantic but undoubtedly less sharp 60 by 40 inch print at 72dpi. In each, the pixels never change, only the way I would be interpreting them would....'
Read more at How Can You Have “Dots Per Inch” if You Don't Have Inches?
Posted by Darren in our Tips category on August 28, 2005