Resolution Images are measured in physical size and resolution. |
Original image from Canon 10D (6.3 megapixel) |
Same image showing the size in inches at 72 dpi. |
Same image showing the size in inches at 300 dpi. |
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Resized to 4500x3000 pixels |
Resized to 4500x3000 pixels, |
For printing an image is almost always saved at the print size eg 10" x 8" at 300 dpi (ppi) For screen use working in pixels is more accurate as sizing in inches or millimeters will not work as screen resolutions and dpi will vary. |