Responding to JP_Hart - Re. 24" m1 apple silicon iMac screen resolutions

Hi,


I am trying to respond to a question that JP_Hart asked about why the new iMac m1 24" says it has a 4480 x 2520 resolution, even though the default is set at half that resolution. Here is what he wrote:



24" m1 apple silicon iMac screen resolutions


I'm confused. Everything I read about the screen resolutions for my new iMac m1 says the screen can display 4480 x 2520 pixels, but the highest setting in system preferences is 2560 x 1440. Am I missing something? Thanks!


Posted on Jul 6, 2021 11:24 AM



I purchased an M1 system last year (September 2022), and I believe that the actual screen resolution is in fact 4480 x 2520 pixels. This default setting of 2240 x 1440 pixels probably takes up four actual dots (2 x 2) per default pixel, but the higher resolution is really there in the screen design.


I figured this out because most native programs on the M1 such as Preview (and others such as MS Word For Mac) use the 2240 x 1440 default, which will show everything zoomed in at 100% to take up twice the actual pixel count each way (4 x total). However, some programs such as Photoshop CC, MS Paint, and File Viewer will display everything in the 4480 x 2520 pixel settings zoomed in at 100%.


On an interesting note, moreover, I once tried installing Adobe Photoshop CS6 for Windows on my M1 through Parallels. And the print on the tools panel, document window, options panel, menu bar, and panel dock was reduced to such a puny size that I couldn't read it even with my glasses on. The interface was, of course, originally designed for systems with lower resolutions - and this means that 4480 x 2520 is your M1 native resolution.



Posted on Nov 9, 2023 11:03 PM

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Posted on Nov 10, 2023 12:13 AM

Tell most programs that a monitor has very high resolution, and they'll assume that is very large, not that it has lots of pixels crammed close together. They will cram more and more stuff onto the screen until text and objects shrink to the point of unreadability.


This is why Apple introduced Retina modes. In Retina modes, there are three resolutions:

  • The Displays, or "UI looks like" resolution. Applications use this for sizing. Old, non-Retina-aware ones believe it to be the actual resolution (and macOS helps them to run in a useful way in spite of this incorrect belief).
  • The resolution of the drawing canvas. This is twice the "UI looks like" resolution, in each direction. Retina-aware applications (that is, to say, virtually all modern ones) get to fill in detail at this level of resolution.
  • The resolution of the actual screen.

System Information (in Ventura, and probably also in Sonoma) helps to pull back the curtain on this. You can select a Displays setting, then go into System Information and see what the corresponding "resolutions" are.


On a M1 iMac in Retina "UI looks like 2240x1260" mode,

  • The canvas has 4480x2160 ("4.5K Retina") resolution.
  • This exactly matches the LCD panel resolution.
  • The physical sizes of text and objects will be roughly the same as on a 27" 2.5K iMac, or a 27" 5K iMac running in Retina "like 2.5K" mode, but you will get less "workspace" because the physical size of your screen is smaller.


On a M1 iMac in Retina "UI looks like 2560x1440" mode,

  • The canvas has 5120x2880 ("5K Retina") resolution.
  • The Mac downscales 5120x2880 pixel images to fit the 4480x2160 pixel LCD panel.
  • You will get as much "workspace" as on a 27" 2.5K iMac, or a 27" 5K iMac running in Retina "like 2.5K" mode, but the physical sizes of text and objects will be smaller because the physical size of your screen is smaller.


If you used a a third-party utility to run the 24" iMac's screen in non-Retina 4480x2160 mode, you would get 4x as much workspace as in the "UI looks like 2240x1260" mode. But all of the text would be 1/4th of the physical size – you'd be trying to cram four screens into one.

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Nov 10, 2023 12:13 AM in response to bearpaw7203

Tell most programs that a monitor has very high resolution, and they'll assume that is very large, not that it has lots of pixels crammed close together. They will cram more and more stuff onto the screen until text and objects shrink to the point of unreadability.


This is why Apple introduced Retina modes. In Retina modes, there are three resolutions:

  • The Displays, or "UI looks like" resolution. Applications use this for sizing. Old, non-Retina-aware ones believe it to be the actual resolution (and macOS helps them to run in a useful way in spite of this incorrect belief).
  • The resolution of the drawing canvas. This is twice the "UI looks like" resolution, in each direction. Retina-aware applications (that is, to say, virtually all modern ones) get to fill in detail at this level of resolution.
  • The resolution of the actual screen.

System Information (in Ventura, and probably also in Sonoma) helps to pull back the curtain on this. You can select a Displays setting, then go into System Information and see what the corresponding "resolutions" are.


On a M1 iMac in Retina "UI looks like 2240x1260" mode,

  • The canvas has 4480x2160 ("4.5K Retina") resolution.
  • This exactly matches the LCD panel resolution.
  • The physical sizes of text and objects will be roughly the same as on a 27" 2.5K iMac, or a 27" 5K iMac running in Retina "like 2.5K" mode, but you will get less "workspace" because the physical size of your screen is smaller.


On a M1 iMac in Retina "UI looks like 2560x1440" mode,

  • The canvas has 5120x2880 ("5K Retina") resolution.
  • The Mac downscales 5120x2880 pixel images to fit the 4480x2160 pixel LCD panel.
  • You will get as much "workspace" as on a 27" 2.5K iMac, or a 27" 5K iMac running in Retina "like 2.5K" mode, but the physical sizes of text and objects will be smaller because the physical size of your screen is smaller.


If you used a a third-party utility to run the 24" iMac's screen in non-Retina 4480x2160 mode, you would get 4x as much workspace as in the "UI looks like 2240x1260" mode. But all of the text would be 1/4th of the physical size – you'd be trying to cram four screens into one.

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Responding to JP_Hart - Re. 24" m1 apple silicon iMac screen resolutions

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