Re: Points vs pixels in a bash script
Re: Points vs pixels in a bash script
- Subject: Re: Points vs pixels in a bash script
- From: Ken Thomases via Cocoa-dev <email@hidden>
- Date: Mon, 8 Jun 2020 21:01:10 -0500
Except that Apple specifically says they're not. From High Resolution
Guidelines for OS X
<https://developer.apple.com/library/archive/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html#//apple_ref/doc/uid/TP40012302-CH4-SW13
<https://developer.apple.com/library/archive/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html#//apple_ref/doc/uid/TP40012302-CH4-SW13>>:
> Note: The term points has its origin in the print industry, which defines 72
> points as to equal 1 inch in physical space. 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 any case, it would be impossible for points to correspond to 1/72 of an
inch, because a given physical screen size can correspond to a different number
of points, depending on the display mode.
Regards,
Ken
> On Jun 8, 2020, at 6:01 PM, Jeff Younker via Cocoa-dev
> <email@hidden> wrote:
>
> Just as an aside, points are not Apple-specifc. They are a typesetting unit
> equivalent to 1/72 of an inch. It's the same unit used for font sizes.
>
> -jeff
>
>
> On Mon, Jun 8, 2020 at 2:43 PM Gabriel Zachmann via Cocoa-dev <
> email@hidden> wrote:
>
>> I know this mailing list might not be the perfect fit for my question,
>> but maybe someone has an idea.
>>
>> I have a problem converting points (I think) to pixels in a bash script.
>> I'd rather not write an extra C/Cocoa utility for that.
>>
>> Using
>> system_profiler SPDisplaysDataType
>> I can retrieve the size of a Mac's display in pixels.
>>
>> However, the command
>>
>> tell application "System Events" to get the size of every window of
>> every process
>>
>> (which I execute from my bash script using osascript) apparently does NOT
>> return window sizes in pixels. I guess it's the strange "Apple points"
>> units. According to my experiments, on my MacBook Pro Retina, for instance,
>> a fullscreen app (e.g., Keynote presentation) has a window size of 1680 x
>> 1050.
>> By contrast, system_profiler reports 2880 x 1800.
>>
>> So, the question is: how can I determine the screen size of a Mac from my
>> bash script in the same units like "System Events" uses?
>> Or, how can I determine the factor by which I have to convert pixels into
>> those other units?
>>
>>
>> Many thanks in advance for any insights or hints.
>>
>> Best regards, Gabriel
>>
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