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Re: units other than pixels very unprecise? (how should 'top' width /height larger than screen be handled?)

From: Steve Schafer <steve@fenestra.com>
Date: Tue, 21 Apr 2009 11:34:50 -0400
To: "www-svg@w3.org" <www-svg@w3.org>
Message-ID: <mapru49pdle70iiqq1h2e4af3ukvcp7oef@4ax.com>
On Tue, 21 Apr 2009 17:10:13 +0200, you wrote:

>Vista, Opera+Firefox
>screen that is obviously not the calculated 96 dpi (17.1" 1920x1200)

It never is, never has been, and never will be. Windows works with
so-called "logical inches" rather than actual inches, and conventional
software can deal with at most two values for DPI, either 96 dpi
(normal) or 120 dpi (large).

Even if Windows could rely on monitors to report their actual nominal
DPI, most monitors have enough adjustability in their image sizes that
it wouldn't be very accurate.

Many applications that really do care about image size (e.g., graphics
editing software, CAD, etc.) allow you to calibrate your monitors, but
the calibration is specific to the application. You can do the same with
an SVG application running inside a browser, but it would be up to you
to provide the calibration functionality, and to save and retrieve the
parameters as necessary.

Steve Schafer
Fenestra Technologies Corp.
http://www.fenestra.com/
Received on Tuesday, 21 April 2009 15:35:34 GMT

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