100% Zoom in Photo software with HiDPI is not correct (1:1)

[Tech6767]

Hello there, I did not find any post about this, so I hope I can get some answers here.

When I am using HiDPI modes on monitors (4K, 1080p, 1440p...) and I am using software like Lightroom Classic or Photoshop,
when I zoom to 100%, the image is presented way smaller, than if HiDPI is turned off and I zoom to 100%.

I guess this is somewhat limited by the frame buffer or whatever, as obviously there is a higher resolution for the smoothing of text, logos etc, which is getting downscaled to monitors resolution.

However, for me this means, I have to decide between HiDPI or being able to correctly zoom to 100% at proper 1:1 pixel level.

Is there a way this could be fixed, or some workaround, so that with HiDPI enabled, it stills scales to the proper size?
Or is it generally better, for pixel perfect work, to turn HiDPI off?

[waydabber]

For pixel-perfect work you can have HiDPI, you only need to make sure there is 1:1 pixel mapping - so in practice you need to use the native resolution or half of the native resolution. On 4K you probably want to use 1080p HiDPI, on QHD you probably want to use 1440p LoDPI (or maybe 720p HiDPI, but that gives an impractically huge GUI), on FHD you probably want to use 1080p LoDPI.

[Tech6767]

Thank you for the tip! For 1080p (23”) to me I rather use LoDPI then, and for 4K (27”) 1080p scaling is ok, but I lose space. My favorite scaling for 4K was 1440p.

[waydabber]

Yes, 1440p is ideal for 27" 4K (I am using that for coding), but when 1:1 pixel mapping is required, it is not ideal.