Le 28/01/2013 20:00, François REMY a écrit : >> For instance, if we say the viewing distance is about half an arms >> length then the size of a reference pixel would be about 1/128 >> physical inches. Given 312 device pixels per physical inch, this >> gives 312/128 = 2.4375 device pixels per reference pixel. > Thanks for the clarification. Is there an online calculator that > gives the optimal size of a pixel (or the DPI) given the viewing > distance? The reference pixel is a visual angle (of about 0.0213 degrees) that projects to 1/96 inch at a distance of 28 inches. So at a viewing distance D, the reference pixel is (1/96) * D / 28 = D/2688. http://dev.w3.org/csswg/css3-values/#absolute-lengths Of course real devices pick some approximation of that for their actual CSS pixels, and the actual viewing distance is often unknown and variable. -- Simon SapinReceived on Monday, 28 January 2013 19:20:33 UTC
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