Display: Altered White Point

ASUS’s ZenUI devices include an application called Splendid, which allows the user to select from a few different display settings or create their own. The controls are limited to a color temperature slider, a hue slider and a saturation slider. Because there’s absolutely no way for a normal user to check if the adjustments they are making are improving or reducing the display’s accuracy, I’ve refrained from adjusting the hue or saturation sliders. However, users can judge when adjustments to color temperature have made the rendition of grey shades less cold than the stock settings, and so I have adjusted the color temperature slider to be 3 positions from the right for the following tests.

As you can see above, adjusting the white balance allows the ZenPad’s greyscale accuracy to increase dramatically, and the display’s blue shift is essentially eliminated. The accuracy is now competitive with the iPad Mini 2, which is where it really should have been in the first place. Adjusting the color temperature to this setting does drop peak brightness by 8 nits or so, but it’s well worth it to improve the appearance of the display to this extent.

Before adjustment on the left, after on the right

Saturation accuracy improves from being less accurate than the iPad Mini 2 to being noticeably more accurate. There’s only so much that can be done by adjusting the display’s overall RGB balance, and I really wish the ZenPad S had better accuracy than this right out of the box, but it’s still a good improvement from the stock settings.

Before adjustment on the left, after on the right

In the GretagMacbeth ColorChecker test there’s a good improvement in the accuracy of color mixtures with the adjusted color temperature. Since the saturation accuracy is still imperfect, there’s inherent error to many of the color mixtures, but the error is to a much lesser degree than how the display looks without any adjustments.

In the end the ZenPad S has a better display than ASUS’s default settings would have you believe. Although the ZenPad S has a laminated display and a wider color gamut than the iPad Mini 2, based on the results of the ColorChecker test I would have to conclude that the iPad Mini 2’s display is superior overall. If you can adjust your ZenPad’s display you will still have a very sharp panel, and in the $199 model it’s definitely best in class. That being said, I think the $299 ZenPad S Z580CA should have aimed higher when it comes to color accuracy, as the two year old iPad Mini 2 still offers better reproduction of grey shades, colors, and offers roughly equivalent brightness and contrast.

A Word On ASUS VisualMaster/True2Life+

The ZenPad S Z580CA comes with a number of display "optimizations" which are similar to those you would find on televisions. I put optimization in quotes because while it is true that slight adjustments to brightness and gamma can help to maintain image quality in different ambient conditions, I have never in my entire life seen a single device where those optimizations are applied in a reasonable manner. The display oriented processing that ASUS performs is marketed as ASUS True2Life+ technology, and I wanted to go over a few aspects of it while also discussing the positive or negative impacts they had on my experience when using the ZenPad S.

Dynamic Brightness and Contrast

These features are often referred to as CABC, or Content Adaptive Backlight Control. ASUS advertises them as a measure to improve image quality, but in practice it's more useful as a tool to save power when applied in the right situations. Unfortunately, the ZenPad S goes overboard with its adaptive brightness, which was also an issue with the ZenFone 2. Because the ZenPad S has a much larger display, the shifting of brightness is far more obvious than on a phone. For example, when scrolling through the recent apps tray you will notice the brightness of the entire display going up and down depending on how light or dark the interface of the application currently in view is. Swiping open the quick toggles in the notification shade also changes the brightness of the display, as do many of the switches to and from applications. A tablet like the iPad Air 2 employs the use of CABC when watching videos, and even in that case I am still not a fan but I understand the purpose. Having significant brightness changes constantly occurring throughout every app and every part of the UI is not something I understand, and it's not something that I feel devices should use outside of something like a power saver mode or when the display APL is incredibly low.


This part of VisualMaster is fairly self explanatory. ASUS performs sharpening as a post-processing effect, and it applies to pretty much all content on the display to varying degrees. I have never seen this feature implemented in a way that is completely useful, and the ZenPad S is no exception. Like other devices that perform sharpening, like the LG G3, the only thing I notice is that text and any objects made of reasonably thin lines has a distracting halo effect. It seems contradictory to the idea of sharpening, but the effect actually reduces the sharpness of what you see on screen, and at times it can actually cause small text to be straining on the eyes. Considering the ZenPad S has a 326ppi display, I don't understand why there's any need for artificial sharpening. To my knowledge, there's no way to disable this feature, so it's something users will have to deal with unless ASUS issues an update with an option to disable it.

Blur-free Motion

The last significant aspect of VisualMaster/True2Life+ is ASUS's Blur-free motion tech. This is essentially the same as the frame interpolation that you see on televisions, which analyzes two frames and attempts to construct an intermediate frame that would go between the two. This feature is actually very successful in making videos appear to be a higher frame rate than they actually are, and it does help to eliminate blurring. I'm actually quite impressed that this can be done as a real-time processing effect on a performance-limited device like a tablet without significant artifacting or other issues. That being said, I fundamentally disagree with the entire concept. To be clear, I am not at all against filming or animating video content at a frame rate higher than 24fps. What I am against is the idea of trying to make content that was not produced at a high frame rate look as though it was. I've loaded as many different videos as possible onto the ZenPad S, and because I'm used to seeing all of them run at 24 or 30 frames per second they just look strange with ASUS's anti-blur processing and frame interpolation.

Unlike the display's heavy CABC, ASUS offers a setting to disable the anti-blur processing in the display section of the settings application. When I first received my review unit, this setting was actually broken which was a huge issue. A recently released firmware update which brings the tablet to V4.1.0 fixed this issue, which is a huge relief. I personally would recommend turning this feature off, but it's great that users are given the option of having it if they want it.

Final Words

Ultimately, I've never seen much appeal in the heavy post-processing that televisions can apply to content, and that hasn't changed with it being brought over to mobile. Most of my feelings toward VisualMaster and True2Life+ are negative, and I really wish there was an option to just turn all the processing off entirely.

Display Camera and WiFi
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  • jjj - Monday, August 31, 2015 - link

    You guys are out of touch. 300$ for what is a midrange tablet? -with misguided AR and horrible design but lets put that aside. This would have been high end 3 years ago. At 40% lower prices it would be ok-ish - at lest for Apple users that got used with the irrational 4:3 AR and are in love with how briefcases used to look 30 years ago. Odd niche to address but w/e.
    PC OEM mentality, just dropping parts in a box. They aren't selling lettuce, they are supposed to be in tech and do much better than nothing. They just need to gift wrap some parts together and that's somehow way too difficult for them. They sell out to Intel, they use no neurons in product design and then they whine that the tablet market is not doing well. And that's not just Asus but Asus at least used to be slightly better than others.
  • boeush - Monday, August 31, 2015 - link

    What's so misguided about 4:3 AR? It's basically the same as the standard 8.5" x 11" paper sheet. It's close to the AR of a typical book. It's pretty great for consuming text-based or text-heavy media (hello - Internet?), or just scribbling on for kicks and doodles (or notes). Only thing its not perfect for is movie watching, but who watches movies on a tiny friggin' tablet screen - unless one's desperate?
  • BugblatterIII - Monday, August 31, 2015 - link

    4:3 is way better for everything apart from movies. It was one of the main reasons my last tablet was an iPad rather than another Android. I'm glad there are now some Android options.
  • ddriver - Monday, August 31, 2015 - link

    Not really.

    Aside from multimedia, widescreen is better for gaming - more immersive, and also for professional software, where in most cases the UI revolves around a hefty side bar and a central viewport. Having a 4:3 screen means you either lose your viewport or your sidebar.

    Honestly, the sole upside to 4:3 might be text editing, but flip a widescreen at 90 degree and suddenly 4:3 is not that much of an attractive prospect.

    The only reason people like 4:3 is because apple is still stuck there, and those people are apple fanboys who care not about usability but to be exemplary corporate zealots.
  • ddriver - Monday, August 31, 2015 - link

    The one thing 4:3 is really good for is browsing poorly designed websites. That's about it... If that's what your computing routine boils down to - go for it.
  • BillyONeal - Monday, August 31, 2015 - link

    As a Nexus 7 and Surface owner, can confirm 16:9 is garbage for anything but movies.
  • FunBunny2 - Monday, August 31, 2015 - link

    Yeah, but *computing* is so 1990s. All these devices are primarily entertainment vehicles. In due time, may be less than a year, there'll be a 16:9/10 watchy thingee so you can consume "Straight Outta Compton" on the way to your cubicle.
  • cwolf78 - Tuesday, September 1, 2015 - link

    As another Nexus 7 owner, I agree wholeheartedly. I will not be purchasing another 16:9 tablet. The shape is just too awkward for anything other than movies which I can't stomach watching on a tablet in the first place.
  • BurntMyBacon - Thursday, September 3, 2015 - link

    I'm also a Nexus 7 owner and I think the shape is perfect. Its just narrow enough to fit in my pocket. Wait, you want to actually use the device. Whaat?
  • BugblatterIII - Monday, August 31, 2015 - link

    So anyone who disagrees with your opinion is an Apple fanboy and/or mostly browses lousy websites?

    I don't like Apple; I reluctantly bought an iPad because it was the best choice for me at the time.

    I have a 24" 16:10 monitor. I always use it in portrait. For videos and games I use my TV. It's a very nice set up and meets my needs perfectly.

    If ever you want to have your views taken seriously then you need to be less dismissive of the views of others.

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