Display Accuracy

As I mentioned in my initial review, the OnePlus 3 targets the NTSC color gamut. I really feel the need to reiterate that this choice of gamut target makes absolutely no sense. The actual NTSC gamut was never really relevant, even back in the 1950s when it was created. This is because the phosphors used in CRT displays of the time simply could not produce such saturated colors with an adequate brightness level. In fact, most modern displays still cannot realize the original NTSC gamut. Because of this, it was assumed that content was created and should be displayed using the gamut defined by the SMPTE C specification, which is actually smaller than the sRGB gamut. SMPTE C also used CIE Illuminant D65 for the white point instead of CIE Standard Illuminant C which has a CCT of 6774K, making it more blue than the white point used in more modern color standards.

If the NTSC gamut is not a sensible target, a good question is what gamut would be? This gets back into the discussion of color management, which is something I've discussed in the past several times and don't want to tread over again in this article. In theory, it would make most sense for OnePlus to target the DCI-P3 gamut, because right now UltraHD Bluray content uses that color gamut in a Rec. 2020 container for future compatibility as displays actually move to Rec. 2020. That is why Apple is targeting the DCI-P3 gamut on their newest devices, and it's why all the high end UltraHD TVs launching this year use it as well.

Unfortunately, Android poses a problem here. Android has no color management at the system level, and so if you ship a wide gamut display you get oversaturation when viewing anything designed for sRGB, which for most people will include every single piece of content on their phone. Because of this, the only two reasonable options are to just constrain your Android smartphone to sRGB completely, or to include separate color modes that allow switching between sRGB and the wider gamut. This isn't the fault of the Android device makers, and it's clear that the inclusion of wider gamut displays is done with good intentions, but for now we have to wait on Google to bring color management to Android.

One thing I didn't do in my review was test the OnePlus 3 against the NTSC standard. Again, I feel this is mostly pointless because you will not be able to find any content anywhere that targets that gamut, but examining how well the display conforms to OnePlus's target gamut would have been an interesting exercise nonetheless. Unfortunately, OnePlus seems to have changed the white point in the normal display mode significantly with this update, which means any results I report won't be representative of how the phone was on its original firmware, or how it may be in the future. We ran into this same issue with the OnePlus One, where later updates completely changed the calibration and made it much less accurate. OnePlus has a bit of a track record of changing key device behavior after release, with another example being the browser detection on the OnePlus 2 which shut off the A57 cluster. I'm not a fan of publishing results that are subject to change with any update, and I'm not going to play the game of testing a phone again after every single update to see if things have changed, especially when changes are made but not documented at all in the update notes.

Display - Grayscale Accuracy


SpectraCal CalMAN

Greyscale accuracy with the sRGB mode enabled is a huge improvement over the standard display mode. The CCT average is slightly below target, but only by a tiny amount. My only complaint is that the RGB balance with the whitest shades is shifted too far toward red, and it would be good to tweak this a tiny bit to make sure 100% white is properly balanced so that the display doesn't have any sort of warm cast on webpages and in Material Design applications. Even with that, the error levels for each individual shade of grey are all at or below three, which is what we're targeting. With these changes the OnePlus 3 goes from being one of the worst displays on record to one of the best, and that's a great thing to see.

Display - Saturation Accuracy


SpectraCal CalMAN

I was originally concerned that it might be too late to properly fix the OnePlus 3's display once phones had shipped, as there's a degree of variance from display to display. However, it appears that the displays, while inaccurate, were defined well enough that OnePlus knew what to tweak to constrain them to sRGB. In the saturation sweep test you can see that only two error values go slightly above three, with the rest being comfortably below.

Display - GMB Accuracy


SpectraCal CalMAN

With great greyscale and saturation rendering you're usually set for accurate color mixture rendering. With its sRGB mode enabled the OnePlus 3 does a great job of rendering the colors that are part of the GretagMacbeth ColorChecker test. The error value is below our target value of three, and pushing accuracy much further doesn't bring many benefits as at this point you already can't discern the difference between the colors and their actual reference colors unless you have them sitting still beside one another.

To say that OnePlus's new sRGB mode provides a substantial improvement in display accuracy would be an understatement. The display has gone from being the most inaccurate display that I've seen in years, to being among the most accurate displays that we have on record. Gone is the ghastly blue shift, and even in the standard display mode OnePlus has toned that down significantly. The gamut matches sRGB very well, and both greyscale and color reproduction is right on target.

Introduction Final Words
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  • Brandon Chester - Thursday, June 30, 2016 - link

    Yes, using our internal search is unfortunately a mistake. I believe it just sends the queries into a black hole. Best to use Google for search :) Reply
  • pillai86 - Thursday, June 30, 2016 - link

    Have you noticed that apps like Skype does not remain online and even some apps don't notify when it's pushed to the background? Skype status turns offline!! Reply
  • name99 - Thursday, June 30, 2016 - link

    Be careful that you are not confusing two different things.
    "Color Management" and True-Tone solve two (apparently OPPOSITE) problems.

    Color Management solves the PROFESSIONAL's problem: I want this content to be captured by a camera here, displayed on a device there, printed on a printer somewhere else, and to look IDENTICAL in all those situations, regardless of the camera, screen, and printer technology.

    True-Tone solves the AMATEUR's problem: I want this content to look "optimal" under different lighting conditions. Optimal is a vague sort of word but it is not the same as "identical".

    It's kinda like the difference between what a dermatologist wants to see when looking at skin (accuracy!) vs what a fashion photographer wants to see looking at the same skin.

    The reason we need the color management is because we need an agreement as to exactly WHAT "240 units of red, 180 units of green, and 27 units of blue" MEANS. This meaning is given in terms of objective physical measurements.

    The reason we need the second is that your brain doesn't actually see color in terms of objective physical measurements. This is not obvious --- after all your eye DOES see color that way. But your brain reinterprets the signal the eye sends to it depending on lighting conditions. So the question is --- do you want your visual device to be aware of and compensate for those lighting conditions or not.

    And the answer depends on what you are trying to do. If you are trying to "see movies and pictures looking as nice as possible" the answer is "hell yes, compensate"; if you are trying to match colors for whatever professional purpose (even something as simple as shopping for a dress) the answer may range from yes to no depending on the exact purpose, but no is probably the usual situation.

    [I do wonder how Apple handles this in terms of shopping for dresses. Has anyone tried this sort of thing? Are the shifts in color from True Tone enough that it would really make a difference?]
    Reply
  • stephenbrooks - Thursday, June 30, 2016 - link

    I thought the distinction was even simpler than that: do you want colours that are intrinsically luminous (like lightbulbs, stars or fireflies) or colours that reflect the light around them (like paint, ink, most surfaces)? Reply
  • jlabelle2 - Friday, July 1, 2016 - link

    Not really. Issue raised by Brandon was about the OnePlus screen targetting a wider gamut screen without propre color managed OS. This resulted in oversaturated colors. ALL the time. Plus, targetting the NTSC color space, they were also completely wrong..
    Now, TrueTone is not impacting the saturation level, to make it simple, it is shifting the white balance. We cannot say this is intrinsically wrong as there is not one true universal white point value as the external lightning is impacting how we see colors. It derived from the 6500K "standard", that's it.
    Still, the impact is very different because you do not end up with fluorescent grass or red carmin tomatoes.
    Reply
  • BenSkywalker - Thursday, June 30, 2016 - link

    Thank you Brandon, genuinely appreciate the follow up on several different levels. Couple things I wanted to point out following your article-

    Many people enjoy the oversaturated colors that wide gamut displays provide when software isn't color managed. I have no issue with that, but users who want an accurate display should have the option to enable an sRGB color mode, and that was the issue with the OnePlus 3 when it launched.


    I am not disagreeing with your sentiment *at all*- but would like to point out a bit of a double standard here. You find it a major issue if a person wants calibrated display but can't have it, but not once, not ever, have I heard you lament a sRGB calibrated display for *not* offering a wider color gamut option. In that same vein, I have what was, last time I looked, the best calibrated display for multi use purposes available and out of the two extremely accurate color modes and the one 'Vivid' option- every person I have asked liked the Vivid option the best(*horribly inaccurate*- this is with the option for ARGB or sRGB).

    You bring up Apple places a great deal of importance on this matter, along with mentioning they have the highest profits. The Tab S from Samsung beat the iPads pretty easily and were in relative terms a catastrophic failure(in terms of profits vs the iPads). Just saying, calibrated displays are just that.

    One final point, and one that I actually think is rather important.

    I walked outside the other evening when the sun started getting low on the horizon and, with the utmost sincerity- the first thing that popped in my head was 'it looks like sRGB out here'- yeah yeah, what a geek, whatever. Point being, the location in which you live and the ambient light you are adjusted to will *greatly* impact what you think looks natural. 30 degrees below zero pictures calibrated for sRGB white points look comically bad and insanely unnatural- just as a summer evening picture from Florida calibrated for Japan's NTSC white point would.

    One other minor thing, you bashed on the display pretty hard in your first review and I understand the point you were trying to make- but the reality of the situation seems to be that most of your issues had to do with the software the phone was using, outside of the pentile layout which nobody is a big fan of, it doesn't seem you had any issues with the screen. Not criticizing, mainly mentioning that you may want to stress the point in future phone reviews about the problems with the physical display(pentile) versus problems with the software(NTSC color target) that may or may not ever be fixed.

    Once again, truly appreciate your follow up, it was a good read and I do greatly admire follow through when there is controversy :)
    Reply
  • 3DoubleD - Thursday, June 30, 2016 - link

    I appreciate your argument that the perception of natural color point is based on an individual's experience and perspective. One who lives in a cold, grey environment versus someone who lives is a warm, tropical environment, will have vastly different perspectives on white point and colors.

    However, I think this is one of the many cases where the masses need smarter people than them to make the correct decision for them. When you tested your colleagues' color mode preferences, you presented them with a choice of which they prefer, and they gave you their honest answer. This approach to validating usage of technology is fraught with peril though. A stronger metric is what people prefer in daily usage. One test gives an opinion of the moment, another test factors in the gamut (pun intended) of experiences that the person has with the technology.

    Now, consider a world where equipment manufacturers abandon sRBG for gamuts of their choosing, each pushing to have their own unique super-wide gamut that they think appeals to their customer base the most. I would argue that in such a world, customers (and businesses/artists/ect) would become frustrated with the inconsistency of how their content is being delivered (as argued by Brandon above). For example, online clothes shopping becomes perilous when the red tie bought ends up not matching... whatever a tie is supposed to match. In many ways, we just came from that world, with displays that notoriously poorly calibrated unless they were professional monitors. Why would we take a step backwards?

    I think everyone acknowledges that sRBG is in no way a superior choice, but it is a standard that is widely adopted. Brandon is correct, Android (as all OSes) should be updated to properly manage color spaces to facilitate the transition to wider gamut standards. Apple really led the way here (as much as it pains me to say that).

    Great update Brandon, way to hold OnePlus's feet to the fire! A friend of mine received his OnePlus 3 and was also super disappointed with the blue tint, he'll be thrilled to hear it will be fixed.
    Reply
  • BenSkywalker - Thursday, June 30, 2016 - link

    However, I think this is one of the many cases where the masses need smarter people than them to make the correct decision for them.


    That, in a nutshell, is the difference between a loyal Apple enthusiast and the rest of the world. Personal choice vs decree from up high.

    Now, consider a world where equipment manufacturers abandon sRBG for gamuts of their choosing


    Like Adobe RGB which has been around and a vastly superior choice since the 90s? Wider color gamuts received no attention, until Apple decided they were important. Much like the abhorrent pixel density iPhones suffered for many generations- not important until Apple's "Retina" marketing campaign. OLEDs staggering advantages in contrast and pixel response also ignored- until Apple makes the swap at which point it will be the greatest thing since sliced bread.

    For example, online clothes shopping becomes perilous when the red tie bought ends up not matching... whatever a tie is supposed to match.


    That's as close to the worst scenario you could have used that I can think of. You want to make your decisions on what to wear under artificial cool lighting based on an afternoon sunlight model? Ambient light in a business environment is significantly 'cooler' than sRGB- it actually falls much closer to what would be considered a hard blue push versus what it seems most people are championing.
    Reply
  • Impulses - Friday, July 1, 2016 - link

    Asking people for their preference in colors WITHOUT a source image that's also accurately captured AND presents a familiar subject is pointless... Skin tones (on an accurately metered photo) are a good test that will often quickly dethrone the preference for over saturation.

    It's like audio testing, crank one device just slightly louder than the other and people will generally prefer the louder one, the doesn't even really mean they like listening louder... It just means we're terrible at assessing certain things when presented with unfamiliar choices.
    Reply
  • name99 - Thursday, June 30, 2016 - link

    I think you have to look at this from Apple's point of view.
    Consider a person who owns a Mac, an iPhone, and an Apple Watch. Now suppose they see the same content on all three of them. It looks surprisingly irritating if the content looks different across the three. (I know this for a fact because it irritated me all the time.) This is especially obvious with faces because we are so sensitive to them --- it only takes a very slight color imbalance for a face to look too red or too green on one screen vs another, even when it is supposed to the same picture (eg the picture you have in Contacts for a person you communicate with frequently via messages).

    That is why Apple cares so much about color accuracy --- it is part of their larger them that you are not so much buying individual Apple products as that you are buying "modules" that represents different user interfaces into a single common Apple Computer held together by your Apple ID and iCloud.

    There's also (to put it bluntly) the issue of taste and price. I don't want to start a flamewar, but my experience is that the same people who are willing/able to pay more care more about visual fidelity/accuracy.
    I see lots of cheap TVs set up to stretch 4:3 content across a 16:9 screen; but I don't see the expensive TVs of my wealthier friends set up that way --- they're not prepared to put up with that visually inaccurate s***.
    Same thing going all the way back to QuickTime. Early MPEG (and some other codecs) used slightly non-square pixels (eg 1.1x wide compared to high). QuickTime, from day one, did the work necessary in the blitter to rescale the image to look correct on screens, whereas every Windows MPEG player of the era that I saw just couldn't be bothered --- it displayed the image with heads that were mis-shapen spheroids and nobody in the world of Windows appeared to care.
    Reply

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