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Published on 10 Feb 2009. Tagged with dpi, pixels, centimeters.
px = cm * dpi / 2.54 cm = px / dpi * 2.54 dpi = px / cm * 2.54
Using a resolution of 140 DPI, 248 pixels would be equal to 4.5 centimeters:
140 ~= 248 / 4.5 * 2.54