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Tried it on my Apple TV connected to a projector, expecting it to fail.

As expected it didn’t work when prompted to hold the iPhone in front of the Tv the iPhone blocked the picture and never startet the calibration.

Again I didn’t expect it to work so I just gave up/didn’t bother.
 
Works like a charm.
LG OLED55E9 here, saw a slight difference in between calibrated and original, almost the same, found the original more pleasing, a bit less warm.
 
I have an LG CX. I don’t have Dolby Vision enabled on the menus as that’s just stupid. With match content it’ll auto change to HDR or Dolby Vision when you watch appropriate content.

I had my tv professionally calibrated when I bought it and had it installed, I’ve just used the calibration feature and the difference it made were EXTREMELY MINOR.

Which suggests to me that what they’re doing is probably actually very accurate!
 
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Just seems to crank up the warmth from everything I've seen from others.

My TV has 4K Doby Vision which takes care of balancing things between the Apple TV and the TV. Seems to do a much better job of adjusting based on content on its own.

It's a bit like those that try to use Mac Fan Control to adjust the fans on their Mac. Pretty sure the engineers who designed it know how to better operate it than you do. I'll trust the pros.

LCD TV makers tend to make the temperatures colder because it accentuates the whites and makes the picture appear brighter. The content is also often mastered to D6500 so that you're more used to white with more blue. The colors in real life tend to be warmer.
 
Unfortunately it doesn't support a projector... since to put your phone one inch from the screen the shadow blocks the image it's supposed to be looking at.
I was able to do it, but wasn’t easy with my Optoma UHD51A. The trick was, get close to the screen and pull back slightly and then angle the phone ever so slightly and then when it starts: Don’t. Move. A. Muscle 🤣
 
I was able to get this to work for me, but I'm using a Panasonic plasma TV I bought in 2010 so definitely not super state of the art at all. The calibration process did change my picture to a slightly warmer tone.

My only nit pick so far is that I kind of wish there was more than just the beach shot to compare before/after.
 
On one of my AppleTV 4Ks it calibrated in 4K HDR, but when I try to calibrate in 4K SDR, it repeatedly crashes out during the white balance portion and prompts to try again.

Another household AppleTV 4K calibrated fine in both 4K HDR and 4K SDR and standard AppleTV did fine as well in SDR.

---

Update: Solved the problem (4K SDR repeatedly crashes out during the white balance portion) by turing off the Auto Local Dimming on the TV (Sony) while running the calibration. Worked the first time out -- of course, after all that, the changes we nearly imperceptible. Thanks to all who posted here which helped take a little advice from here and there.
 
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The process seems a bit buggy. It failed several times (TV never brought up the calibration screen after prompting the phone into calibration mode).

After restarting the ATV and the iPhone then it finally brought up the calibration image, but the calibration failed and only worked on the second try. I think the phone needs to be VERY close to the screen (1"-2").

Result was subtle (a slight shift towards warmer tones). Unfortunately the preview of the effect showed ONLY ONE sample scene (a beach flyover, not the Golden Gate Bridge from the PR), making it hard to evaluate the general impact on a more typical TV moment.

I'm sure there will be no impact on Snyder's Justice League since there is no color left! ;-)
 
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It's a bit like those that try to use Mac Fan Control to adjust the fans on their Mac. Pretty sure the engineers who designed it know how to better operate it than you do. I'll trust the pros.
Nah, programs like Mac Fan Control is great. Apple made sure that fans will not go below system requirements at any given time, but these programs lets you pull more air through on the cost of noice, and since apple adjust their fan speed for as much time spend silent as possible this extra air is great in times where heat dissipation is more important than fan sound. Like work loads where you can leave, gaming, or anything done where you can were a headset.
 
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So I tried to use it last night on my LGC9 OLED and it told me it was not required and wouldn’t let me
Same here. I don’t necessarily think it means there’s no calibration that would be beneficial, though. You set your white balance to Warm1 or Warm2?
 
I didn't, but that sounds like it MIGHT work. I'll give it a shot. I wonder if the fact that it would be a mirror image would mess it up.
It's not using an image; it's calibrating based on flat colors (white, RGB) using the color temperature detector for TruTone color (or whatever it's called).
 
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so I'm gonna trust an iPhone that can't get its own colors right to color balance my tv? Phuket jus take my money, also when can i use this feature for macOS?
 
First you'd have to find a TV without Dolby Vision....

I mean seriously, I purposely bought TV's with Dolby Vision when I upgraded my Apple TV's last time. And they are several years old now. And they weren't expensive TVs.

I can't imagine this is very useful to many.
There is no point enabling Dolby Vision on content that isn’t mastered in Dolby. In fact, it leads to a worse picture. The menus in Apple TV, for example, look washed out with Dolby enabled because they’re not mastered for HDR or Dolby. This is why you should use 4K SDR as default and Match Range so the ATV will automatically switch to Dolby/HDR for any content that uses it.
 
If you’ve gotten a 4K TV set up and calibrated by a professional, odds are you won’t see a difference. In fact, if you had a professional calibrate your tv, I’d recommend not even messing with this feature.
Agree, tired it on my tv, made my tv picture look piss yellow, looks like True Tone for your tv.

Good thing is you can easily remove it.
 
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Calibrated our main TV with a small but noticeable difference. Not able to calibrate home cinema projector (as mentioned in an earlier post the phone causes a shadow and it doesn't work with camera facing projector.) I was able to calibrate the audio on both TV and projector.
 
Doesn’t work for me. Says “Preparing…” and eventually times out. If I choose Retry it says to hold the phone front facing to the TV, but the TV just sits on the initial “Adjust Color Balance” instruction screen.
 
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There is no point enabling Dolby Vision on content that isn’t mastered in Dolby. In fact, it leads to a worse picture. The menus in Apple TV, for example, look washed out with Dolby enabled because they’re not mastered for HDR or Dolby. This is why you should use 4K SDR as default and Match Range so the ATV will automatically switch to Dolby/HDR for any content that uses it.
Your information is vastly outdated.
 
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