- From: David Woolley <forums@david-woolley.me.uk>
- Date: Sat, 28 Mar 2009 14:14:12 +0000
- To: "www-style@w3.org" <www-style@w3.org>
Giovanni Campagna wrote: > > I ask the question again "how the UA *or the system* can convert > pixels to centimeters, since they have no knowledge about the diagonal > of my monitor?". Obviously the UA can just assume 1 in = 96 px = 2.54 > cm and convert like that, but the meaning of lenght is distorted. Even > if the system knows the output resolution, it will not know the > scaling done by the monitor. Because the monitor description, which modern systems should be able to obtain by plug and play, tells the GUI the physical size of a pixel, and even if this information is incorrect, the user agent assumed size of a pixel will have the same proportionate error as the size it actually uses to display a cm, so will cancel out in the round trip from px to px. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work.
Received on Saturday, 28 March 2009 14:15:25 UTC