- From: Alan Gresley <alan@css-class.com>
- Date: Mon, 11 Jan 2010 19:06:17 +1100
- To: Alex Mogilevsky <alexmog@microsoft.com>
- CC: "L. David Baron" <dbaron@dbaron.org>, "robert@ocallahan.org" <robert@ocallahan.org>, www-style <www-style@w3.org>
Alex Mogilevsky wrote: > Apparently the whole point of discussion is a concept of treatment of 'pt' that is different from other units when it relates to actual display resolution, and it is a kind of treatment that I was not aware of. I have been paying attention to this thread but I am still not sure what exactly is the relationship of 'pt', 'px' and 'in' are in Mozilla and what becomes problematic when dpi is different from 96. Hello Alex, maybe this will help your understanding of the difference between 'pt' and 'px' with a different DPI setting. <http://css-class.com/test/css/box/pixels-points-dpi.htm> 'pt' are rendered larger when the DPI setting in increased or rendered smaller when the DPI setting is decreased.'px' stay the same. In the days of the old west, you had monitors that show 72pt per inch (or 96px per inch) and if you were to get a ruler and measure this inch on a curved screen (with a flat ruler) then it would be about the same length. This is the legacy of old television screens, maths in early technology and binary code. <http://en.wikipedia.org/wiki/Technology_of_television> "A typical resolution of 720×480 and 720x576 means that the television display has 720 pixels across and 480 or 576 pixels on the vertical axis. The higher the resolution on a specified display the sharper the image." For 720x576 we can divide this by six to get 120x96 and this divided by six again gives us 20x16 with is a ratio of 5:4. For 720x480 we can divide this by six to get 120x80 and this divided by five gives us 24x16 with is a ratio of 4:3. -- Alan http://css-class.com/
Received on Monday, 11 January 2010 08:07:02 UTC