On Monday 02 March 2009 6:03:52 am Matthew Paul Thomas wrote: > Chris Cheney wrote on 28/02/09 21:08: > > > > On Sat, 2009-02-28 at 12:38 +0100, Markus Hitter wrote: > >... > >> I can understand this is difficult to get swallowed. For 40 (or more) > >> years now, the rule was 1 pixel = 1 dot on the screen. A picture, > >> 100px x 100px in size used to use exactly 100 x 100 dots on screen. > >> Now, this is no longer true. > >... > > However, it seems you have gotten several things confused. > >... > > Px means pixel which is a picture element and is an abomination that it > > was ever allowed into the HTML specification at all. 1 pixel definitely > > means 1 picture element (dot) on the screen. That is where the word > > pixel comes from. Redefining pixel to mean something else instead of > > just using Pt properly would be crazy. > > Actually, Markus is quite correct. For Web development, "100px" has not > meant "100 pixels" since CSS1 in 1996. Rather, it means "100 × (0.0227 > degrees, at a typical viewing distance, rounded to the nearest pixel)". > This conveniently equates to 1 pixel on a 90 dpi display viewed at a > distance of 28 inches. But if either the viewing distance or the DPI is > much different, the calculation changes.
So, for people who put their face one-handspan from the screen, what's a pixel? -- Mackenzie Morgan http://ubuntulinuxtipstricks.blogspot.com apt-get moo
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