Re: OS X Preview -- wrong size
Re: OS X Preview -- wrong size
- Subject: Re: OS X Preview -- wrong size
- From: bruce fraser <email@hidden>
- Date: Thu, 24 Feb 2005 14:00:52 -0800
The mystery is with CRT monitors, because they have geometry
controls. By tweaking the geometry controls, you can vary the real
physical ppi on the monitor dramatically, and software has no way of
knowing what the actual image area is on the display. It can know the
size of the display and the number of pixels being displayed, but it
can't know how much of the display's potential image area is actually
getting used, hence it can't determine the true ppi without user
input.
At 1:42 PM -0800 2/24/05, Sam Smith wrote:
> This is by way of explaining why things may appear to be the
wrong size on the screen.
Quartz uses default units of 1/72 of an inch. They also implicitly
assume the display is 72 dpi. To be precise: if the developer doesn't
scale a view
and asks Quartz to draw a 72 x 72 square, it will draw a 72 pixel by 72
pixel
square. This will have an actual (measured with a physical ruler) size
of about
3/4 inch on many modern displays.
If the display is at 90 PPI. 72 x 1.25 = 90.
If the display is at 72ppi it will measure 1". 72 x 1 = 72.
What's the mystery?
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