I have a few different issues that feel linked, so I’m posting them as a single topic.
While many aspects of the Spectrum are very nice, image quality when in HDR mode is made disastrous by these issues. Hopefully they can be mitigated in software
I’m using firmware 105, and most of these issues were there in 102 as well. They’re all present only when the screen runs in HDR mode. They all happen whether the screen is connected to my Monterey MacBook via USB-C, or my Windows 10 PC via DisplayPort.
Of note! The videos I’m linking to are themselves recorded in HDR, encoded in HEVC, so they might look weird or blown out, depending on your computer/OS/video app.
The Spectrum’s vertical dimming zones are pretty chunky, and sometimes have drastically different brightness; this results in extremely visible blooming, which is super distracting when watching a movie.
Here’s an occurrence of contrasting zones. On the right, as some small points of light shine through the window, the whole right side of the image lights up. The effect in the recording is much softer than what’s actually seen in person.
In some situations, the backlight’s change in brightness causes the screen to very visibly flash whenever a white subtitle becomes visible, or goes away. You can see a subtitle flash happen six times in this recording. Once again, it’s even more visible IRL than in the recording.
I mitigated this by making subtitles dark gray wherever I could… which makes them a lot harder to read!
For some reason, dimming zones seem to often interfere in a way that produces a very visible vertical line, that slides left and right as the brightness changes. You can see the line move around in this recording, on the left of the screen.
This one feels a lot more like a hardware defect in my unit. In some situations, a darkened rectangle appears on the left of the screen, towards the middle. This is not a rendering glitch, as I’ve seen it happen both in games and movies, and both on the Mac and the PC.
You can see the rectangle in this recording of Receiver II, running (I think) in windowed fullscreen on Windows 10.