Re: OS X Preview -- wrong size
Re: OS X Preview -- wrong size
- Subject: Re: OS X Preview -- wrong size
- From: Sam Smith <email@hidden>
- Date: Thu, 24 Feb 2005 13:42:29 -0800
> 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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