Re: Making pt a non-physical unit

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 2–50 metres (from the first row to
the back row). Such estimates are useless.


--
cheers,
-ambrose