Excellent question from +Aden J Purcell:

Apparently the display on the G4 follows the DCI color space instead of sRGB. Do you know if this is a good thing? I thought movies were mastered in sRGB, not DCI? And even if LG has accurately calibrated the G4 to DCI, could they have messed up the gamma? Or is a 2.2 gamma part of DCI meaning LG can't mess with it otherwise they can't market their device as DCI compliant?

Like +Samsung Mobile has done before, marketing their Super AMOLED devices as color accurate according to the Adobe RGB standard to appeal to photographers, +LG Electronics described the LG G4 display as following another standard they call "DCI"

First of all, DCI acronym stands for "Digital Cinema Initiatives, LLC" and not the name of a color standard.
Assuming they are talking about DCI-P3 color gamut, it's the gamut part of one of the color encoding formats for professional cinema projection.

DCI-P3
– white point coordinates x: 0. 314, y: 0.351 vs sRGB x:0.3127 y: 0.3290
– gamma 2.6 vs sRGB around 2.2 average
– pretty wide gamut, color primaries color hues not being the same as sRGB: green has less yellow, red has less orange,

A comparison of sRGB and DCI-P3 color gamuts by +Jeff Yurek's blog:
https://dotcolordotcom.files.wordpress.com/2012/12/pantone_2013_dot_color.png
Additionally, the white point is not even the same.

Today, Android applications lack color management abilities which would allow to convert one color encoding to another and display content as intended on various displays seamlessly.

+LG Electronics throws in the "DCI" name to impress reporters and customers with the intent to convince them of the benefits in color accuracy and true-to-life color reproduction of their new display.

However, when checking what they're mentioning stands for, it is clear that displaying today's content, which color are encoded using sRGB (Rec.709 gamut and around 2.2 gamma) on a "DCI-P3" display (wide gamut and gamma 2.6) would lead to particularly inaccurate color rendering.
Colors would not be rendered with the right hue, look too intense (over-saturated look), and annoyingly too dark due to the gamma 2.6, which increases saturation even more.

In conclusion, +LG Electronics is proud of their new wide-gamut display but please don't be fooled by the marketing mumbo-jumbo employed.
It doesn't correspond to any professional standard or any standard altogether, it will distort colors instead of rendering them faithfully, and this is mostly a response to Samsung, just as bogus Adobe RGB accuracy claims.

Source: DCI-P3:
http://www.hp.com/united-states/campaigns/workstations/pdfs/lp2480zx-dci–p3-emulation.pdf

#supercurioBlog #LG #critic #marketing #color #display



www.hp.com/united-states/campaigns/workstations/pdfs/lp2480zx-dci–p3-emulation.pdf

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Sony mobile made progress with their displays hardware with the Z2. Their previous panels had sub-standard viewing angles with no benefit in contrast ratio

So what they have now is a decent IPS panel, using a blue led as backlight plus phosphors to alter the wave-lengths generated, which results in a wide gamut display with satisfying power efficiency.

Conceptually, having a wider gamut than the common Rec.709 and sRGB is interesting because the human eye can perceive colors so much more intense than sRGB gamut, around in an approximate fashion since CRT monitors.

But let's hold back here: what's a display?
It's a rendering device, reproducing colors previously encoded into numbers or voltages in the old days.

So a good display is what reproduces the colors as they're supposed to. Typically, as the graphic artist intended or as a camera encoded them from what hit its sensor.

As a result what's desirable is both a camera (or artist) and the display agreeing on how to record, encode and present again those colors.
Well that's the basics of display calibration.

Sony has an interesting technology, allowing to reproduce more intense colors and most people craves those, they produce emotions.
But today's content usually are not encoded in a way that can represent those colors intensities.
It's just not here anymore!
Colors that are in nature, that also can be perceived by your eyes but can't be stored in the mathematical encoding of sRGB (computers) or Rec.709 (HDTV) gamut (both share the same)

Sony has this display on the Z2 but unfortunately didn't implement anything to display images according to how their colors are encoded.
Instead, they'll simply let the display stretch colors intensities, and also show the wrong color hues because the Z2 panel RGB primaries are not aligned with sRGB gamut.

That's the typical issue when you're lacking color management.
Instead of converting a color space to another, you're not processing anything and show un-corrected colors.

And then here comes the marketing department, who made this page that totally baffles me by the quantity of bulcrap it contains.
It's pretty much feeding readers lies about color reproduction and accuracy to convince them the oversight is actually not only a good thing, but also right and accurate.

Quoting:
With IPS technology, the Xperia Z2 offers an improved viewing angle. So you get super sharp images and accurate colours, no matter which angle you’re looking at your device from.

All things considered, if you compare to the Xperia Z or Z1 yes the colors are indeed more accurate.
It doesn't make Z2 display a color-accurate display tho.

TRILUMINOS™ technology uses LEDs, which emit purer reds and greens, creating a brighter and more uniform light that captures the true colours of the source. From lush landscapes, to natural skin tones – Sony delivers a significantly wider colour range. So you can view every moment in astonishingly authentic colour and breathtaking quality.

Wait wait wait.
Sony, are you really saying that the display is actually a camera? capturing the true colours of the source.
A camera captures colors. Not a display.
See, that's the rhetoric used to pretend that the display knows (!) what were the colors when captured, and thus can reproduce them accurately.
Needless to say, it's complete nonsense.
Then continuing on, Sony tells you the display renders authentic colour

Science check: that's absolutely wrong. Remember I told you sRGB gamut is far from covering what your eyes can perceive. So if your camera records image in sRGB, those intense colors are gone. Like an intense red will be recorded as a less intense red, that's all.
So how could a display know what the authentic colors were.
Was the display here with you? What does that even means.
No, the display will only render colors encoded to be a specific tone and intensity to another color. Because.
Of course it won't be the real color, unless you get 16.7 millions against one lucky, assuming this color was even part of Z2 reproducible colors.

This new innovation combines red and green phosphor with blue LEDs and customised colour filters to produce a brighter and more uniform light. Capturing true colours without the risk of oversaturation.

The marketing here using a formulation optimized to trigger the placebo effect. And believe me placebo (at any price point) sells with almost no limit when it's about display or sound quality.
Even medicine. But people rightfully take this a little bit more seriously ­čÖé
So yes colors are over-saturated, it's a measurable fact.
But maybe if Sony tells you they're not you'll believe them. No harm trying right?

The Intelligent Image Enhancer reproduces the vividness of the image in its original colour

Again, same thing. Boosting colors not as selectively as described here won't get you anywhere near the original color.
More nonsense.

If you actually watch video content today on a Z2, the color processing might make you uncomfortable.
They take standard content, stretch colors to the wide gamut of the display, and on top of that boost colors some more.
The result looks simply ridiculous, even on skin tone which is a big no-no.

But well, this is Sony's marketing so nothing new here, I think it's a tradition of theirs for consumer products.

Personally, I really don't like abusive usage of "color accuracy" mentions.
That's why I'm working on measurement tools allowing to verify claims, because color is actually a science.
Also, there's a lot of progress to make thanks to wider gamut displays.
Those are undoubtedly the future, but today's ridicule usage made of them mostly discredits their benefits.

#supercurioBlog #color #display #critic #marketing



Xperia™ Z2
Sony’s best phone camera is the Xperia Z2 which features a 20.7 MP camera and 4K video recording – all packaged inside a gorgeous aluminum frame.

Source post on Google+