如何在 Windows 10 上将 DPI 比例设置为小于 100% - 具有多个显示器

Question

所以我有一个分辨率为 1440p 的 32 英寸大显示屏，我想将 DPI 缩放设置为 75% 而不是 100%。但我找不到任何方法可以在多个显示器上执行此操作。

我目前有：

• 显示 1 [2560 x 1440]（我想更改主显示）
• 显示器 2 [2560 x 1440]（此显示器为 27 英寸，所以保持原样就可以了）
• 显示 3 [3840 x 2160]（设置为 100%，正常）

这个技巧（点击我）通过一些注册表项（LogPixels 和 Win8DpiScaling）更改 DPI 缩放，但是当我使用该技巧时，它会缩小显示 3 而不是显示 1。

有办法让它发挥作用吗？我认为微软没有理由限制显示缩放。

注意：我有一台 2070 super，所有显示器都通过 Displayport 直接插入 GPU，并在撰写本文时使用最新的可用固件（2021 年 9 月）

Answer 1

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长话短说：

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除了技术限制之外，还有非常可靠的用户体验原因可能不允许这样做。

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No, Windows will not let you set UI scaling below 100%.
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While I would love\xc2\xb9 to be proven incorrect, the implications of scaling at less than 100% are so fraught that this limitation is unlikely to change in the near future.

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Background:

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This has been the case for ages, likely since Windows first introduced the feature.

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Compatibility with current software

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The only ~purely technical~ reason I can think of:

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• The 100% scaling size likely uses the smallest base image (e.g. Explorer and Taskbar icons, mouse and text cursors) resources included in various existing Microsoft and 3rd-party applications.
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User experience

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Going below the 100% point may cause small UI text and icons, especially in application toolbars and the Taskbar to be blurred to the point of ambiguity.

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• Those fine lines in the taskbar 'Windows' menu icon? Blurred or gone.
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Taken to the extreme, the UI ~might~ become so unreadable that the user is effectively prevented from being able to read the text even in the 'Settings' window and therefore is 'stuck': i.e. not able to navigate through 'Settings' to restore the original '100%' scaling mode.

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• (Luckily, Windows is never used to run any SCADA software where confusing two icons could theoretically cost money or lives.)
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Performance:

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Since those carefully-designed graphic assets don't exist, if sub-100% scaling were allowed, it would also likely cause extra CPU/GPU workload - that is why only certain fixed sizes of up-sampling are shown on the normal Display settings screen and why the Advanced scaling settings screen warns that custom scaling between 100-500% is "not recommended".

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• That might also apply to any fixed scaling option offered below 100%, and absolutely would for custom scaling sizes.
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Some people enjoy reading:

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Vector-based TrueType/OpenType fonts usually contain a ~lot~ of manual tweaking / hints to enable readable display of very small point sizes.

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The marketing department & friends of the C-suite

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Could they implement this at a limited range of options? 90%? 75%?

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Perhaps - but it's extra testing for a horrible-looking edge case.

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• The existence of the option, even if only available as a registry hack, might cause some people to actually use it in kiosks and other public-facing displays; this risks the same sort of bad PR as when a BSOD is seen on the 'arrivals' screen at a train station or airport monitor.
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Combined with the first example below, even a 90% option could cause trouble in some environments.

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Example and tutorial:

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1. Imagine how Windows might look displayed on one of those cheapo '1080p-supported' projectors that actually only contains an imager with a native pixel resolution of, say, 1024x576 (or even 480x234).

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   • Windows thinks it can send 1080p, since that what the HDMI connection advertises, so it does: any text / vector content looks atrocious.
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   • (At least in this case the user could normally\xc2\xb2 unplug the projector and reconnect to a normal monitor to restore functionality.)
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2. See for yourself... while connected to any monitor (at that monitor's native resolution), with Windows set to 100% scaling:

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   1. Open Windows Notepad
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   2. Type or paste in any block of text
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   3. Now, use the Zoom Out command from the View menu\xc2\xb3 five or more times in a row
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   • While not an exact analogue, you may still see how hard it could be to read down-sampled text, even when very high-contrast (the best-case scenario).
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\xc2\xa0\xc2\xa0 \xc2\xb9: As someone currently typing this very answer on a 1080p connection to a 55" 4K television as a second monitor, I came across the question very much hoping this was possible. Sadly, logic intervened and killed my potential joy.
\n\xc2\xa0\xc2\xa0 \xc2\xb2: Unless the computer is actually stored somewhere locked or inaccessible, such as a NUC-style PC hidden above the false ceiling in a conference room.
\n\xc2\xa0\xc2\xa0 \xc2\xb3: Alternatively, press <CTRL>-<Minus> five or more times.

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