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rocknbil - 5:55 pm on Feb 1, 2012 (gmt 0)
Sorry had my math wrong. :-) It's 2.5 inches. Yes they are 300 DPI, but 300 DPI is the average for up to 150 LPI (screen lines per inch in printing) screens. If you do the math (correctly :-) ),
750 pixels / 200 = 3.75 inches
750 pixels / 300 = 2.5 inches
Adjust appropriately for cm. Even that can be "stretched." We used to use 250 DPI images for 150 LPI printing with no noticeable image decomposition.