> which of the options you've tested you think would be best?

Well, for option 2 / dimming, some filter involving gamma tweaking because it 
eliminates the most common complaint about the dimmed map, loss of contrast, 
without clipping some input ranges to completely black or white. Also, IMO it 
looks like the most natural dimming of the light map. However, the gamma filter 
still has more parameters that can be tuned.

For option 3 / inverting, the native `hue-rotate(180deg)invert(95%)` seems to 
be the variant retaining the most contrast and the darkest one. While the one 
with transforms in a YIQ-like color space can be tuned further by adjusting the 
transformation into and out of that space, from what I've been able to discern 
by fiddling around, fine-tuning away the old-photo-like yellowish look would 
take more effort than it's worth.

> [This 
> proposal](https://github.com/openstreetmap/openstreetmap-website/issues/5324#issuecomment-2480755496)
>  would let you easily disable the filters by changing the map theme to light.

And we don't even have to choose a second option if we add more radio buttons 
and let the users do it:

### Map theme
🔘 Auto
🔘 Light
🔘 Dark

### Dark map theme
🔘 Dimmed
🔘 Inverted
☑ Show dark tiles if available

Yes, kind of kidding, but depending on where the preferences will be put there 
might be more than enough space anyway.

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