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Re: Making pt a non-physical unit

From: Ambrose LI <ambrose.li@gmail.com>
Date: Sat, 16 Jan 2010 04:39:21 -0500
Message-ID: <af2cae771001160139l16d36bc1s4e492f922d2a38d1@mail.gmail.com>
To: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Cc: "Tab Atkins Jr." <jackalmage@gmail.com>, Brad Kemper <brad.kemper@gmail.com>, "robert@ocallahan.org" <robert@ocallahan.org>, www-style <www-style@w3.org>
2010/1/16 Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
>
> If print vs screen is to be considered, I'd rather see it influence
> whether viewing distance should be considered or not, where print
> sizing would be unaffected by (assumed) viewing distance, in contrast
> with screens and projections, where an estimate of the viewing
> distance can be done from the device size (an information typically
> available from the o/s). For example, an iPhone with a 160dpi (=5/3
> the CSS dpi) is usually held a 3/4 the distance of a typical monitor,
> thus leading to a 1.25 (rounded to 1) correspondence between CSS and
> actual dpi.

But how do you estimate the viewing distance, even if only
approximate, for projections? In a large lecture hall or meeting room,
it would be a very large range, say 250 metres (from the first row to
the back row). Such estimates are useless.


--
cheers,
-ambrose
Received on Saturday, 16 January 2010 09:39:54 GMT

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