-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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. > Also where is a 100x100 image not displayed as such? >... Whenever it is displayed on a medium that has more than about 145 dpi. For example, when it is printed on a 300 dpi printer. Cheers - -- Matthew Paul Thomas http://mpt.net.nz/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkmrvRMACgkQ6PUxNfU6ecp/SgCeJuvn5kc0xFdhqENkrR97X/gu oScAoJmnjus9RqXb5H6QUVjZihtMDPXO =LIto -----END PGP SIGNATURE----- -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
