Re: Confusion about screen resolution
Re: Confusion about screen resolution
- Subject: Re: Confusion about screen resolution
- From: Ken Thomases via Cocoa-dev <email@hidden>
- Date: Sat, 22 Feb 2020 17:29:36 -0600
On Feb 22, 2020, at 2:48 PM, Rick Aurbach via Cocoa-dev
<email@hidden> wrote:
>
> I think you are confusing pixels and points.
>
> A pixel is an addressable light-emitting area on the screen. Your screen
> contains 2880 X 1800 pixels.
>
> But a typographical point is a unit of distance. There are [72] points per
> inch. (I.e., a typographical point is 0.0139 inches or 0.353 mm).
You are correct to emphasize the difference between points and pixels.
However, points (as used by Apple) are *not* typographical points. They are
arbitrary.
From
<https://developer.apple.com/library/archive/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html>:
"When used in reference to high resolution in OS X, points in user space do not
have any relation to measurements in the physical world."
In particular, you can set macOS to scale the display to other point sizes. A
point can't equal 1/72" in all of them. And, of course, many monitors were ~96
DPI for a long time back when pixels and points were equivalent.
-Ken
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