The iPhone XS & XS Max Review: Unveiling the Silicon Secrets

Name: The iPhone XS & XS Max Review: Unveiling the Silicon Secrets
Item: The iPhone XS & XS Max Review: Unveiling the Silicon Secrets
Author: Andrei Frumusanu

by Andrei Frumusanu on October 5, 2018 8:00 AM EST

253 Comments | Add A Comment

253 Comments

Camera - Daylight - More HDR & Portrait

I wanted to have a second page of daylight photos because I wanted to spend a bit more time and have a tad more varied scenes for to test Apple’s SmartHDR – please enjoy.

[ iPhone XS ] - [ iPhone X ] - [ iPhone 7 ] - [ iPhone 6S ]
[ Galaxy Note9 ] - [ Galaxy S9+ ] - [ Galaxy S8 ]
[ LG G7 ] - [ LG G6 ] - [ LG V30 ] - [ OnePlus 6 ]
[ Mi MIX2S ] - [ Pixel 2XL ] - [ P20 Pro ]

This tunnel was a fun little test – the other end was sunlit while obviously quite dark from my side. I thought this would be a good little visual representation of the raw dynamic ranges that the phones would be able to capture.

Indeed, the iPhone XS is able to go a lot further into the end of the tunnel than the iPhone X, or for that matter, most other phones. This is an extreme show-case of Apple’s new HDR processing and how it’s able to play with bright highlights in scenes.

One scenario that Apple showcased during the keynote was a shot directly facing the sun. I’ve had users in previous reviews bombard me with comments as to that’s not how you should take a photo. To them I say: that’s an outdated notion of photography.

As computational photography becomes an ever increasingly common theme in devices, we’ll see more and more scenes like this one where shooting against the sun should be no issue at all.

The iPhone XS dramatically improves the shadow detail, and is able to notably reduce the sun’s halo in this shot, but I do think Apple might have overpromised a bit on the notion of computational photography. The best counter-example of this is to just switch over to what the Huawei P20 Pro was able to achieve in its 10MP AI mode, by far surpassing all other phones in the captured dynamic range of the scene. This facet of smartphone photography really opens up a new area of competition, and hopefully we’ll be seeing some exciting things in the future.

This shot follows the same themes we saw on the previous page, the iPhone XS handles the shadows a lot better and gives a lot more details over the iPhone X.

Samsung again opts for a much brighter picture, but I do think it comes at some cost of detail. Again I think the OnePlus 6’s HDR processing is an excellent middle-ground that would please most people, although Apple has a tad more natural look going for them.

In less direct sunlit environments, the difference between the iPhone X and XS might not be directly visible the thumbnails, however opening up the full resolution image showcases the XS’s significant increase of detail and textures throughout the whole scene. The larger pixels of the XS sensor along with the deeper DTI (deep trench isolation) results in significantly increased spatial resolution – even though the sensor has the same amount of pixels and even has a wider field of view, resulting in less pixels per given object.

Again Samsung tends for a brighter exposure that I think is a bit too much – detail slightly trails the XS. OnePlus bridges the two vendors in terms of exposure and detail.

This scene was mostly in the tree shadows, sun sunlit spots coming through the gaps. By now we should understand where the XS’ strengths are: brighter and more defined shadow details.

I think Apple nailed this shot and it has the best balance of exposure as well as the best detail retention. The OP6 closely followed in terms of exposure, but lost in terms of details. Samsung here just overdid it with exposure and just flattens the scene too much.

[ iPhone XS ] - [ iPhone X ] - [ iPhone 7 ] - [ iPhone 6S ]
[ Galaxy Note9 ] - [ Galaxy S9+ ] - [ Galaxy S8 ]
[ LG G7 ] - [ LG G6 ] - [ LG V30 ] - [ OnePlus 6 ]
[ Mi MIX2S ] - [ Pixel 2XL ] - [ P20 Pro ]

Finally the last shot, is again a good showcase of HDR of the different phones. The iPhone XS continues to perform very well here, showing the improvements we’ve seen in previous scenes. Again Samsung is brighter, but slightly loses out on details.

Portrait Mode

[ iPhone XS ] - [ iPhone X ]
[ Galaxy Note9 ] - [ LG G7 ]
[ OnePlus 6 ] - [ Mi MIX2S ] - [ Pixel 2XL ]
[ P20 Pro ]

Portrait mode is something that’s been quite the rage nowadays, and the iPhone XS promises to take advantage of its new inferencing engine power to create much better separation maps between the foreground subject and the background, to which the computational bokeh effect is applied.

Shooting in portrait mode on most phones means that the actual shot will be taken with the telephoto module, while the wide main camera is also doing work by serving as the depth sensor. Single-module phones such as the Pixel 2 rely solely on the computational power to discern between the subject and the background.

The results on the iPhone XS showcase a significant improvement in the image quality of portrait mode. First of all, the exposure and colour balance of the shot is just significantly better, something that’s universally valid for telephoto shots on the new XS.

The actual bokeh effect on the XS looks to be applied a lot more graduated, and while it’s still possible to see the edge of the pattern in some cases, it’s significantly improved.

This gradual application is what makes the iPhone’s portrait mode stand out to other phones. Only Huawei and Samsung somewhat manage to go a decent job, while all other phones look quite rubbish to be honest, with visible zigzag patterns around the subject.

Daylight Conclusion

Overall in daylight, the iPhone XS is easily a top-tier performer. One thing that I didn’t bring up throughout is picture capture consistency, and here the iPhone XS just shines. Every time you take a picture, you can be assured you will get a good shot – and there’s little to no difference in consecutive shots.

Apple’s new SmartHDR is a definite win, and allows for much more detail in the shadows, all while retaining good highlights in the scenes. The new sensor module is definitely showing its strengths even in daylight, as every shot that wasn’t in direct sunlight was able to showcase much improvements in terms of details as well as textures. I attribute this to the new sensor’s much improved DTI – something which results in the iPhone XS gaining quite a bit more resolved spatial resolution, even though the megapixel count is the same.

The new slightly wider viewing angle on the main camera is something that I enjoyed, and I hope Apple continues on in this regard. My iPhone X seems to suffer from lens defects in the left part of the scenes – the iPhone XS showcases no such chromatic aberrations and is sharp until the edge of the frame.

The biggest improvement seems to be on the telephoto lens. While on the iPhone X and before, the telephoto lens could result in quite different colours and exposures. On the iPhone XS the new module seems to be perfectly in balance with the main camera, so that there’s just very little difference in the picture between the two.

While sometimes I do prefer OnePlus 6’s HDR, the XS is more consistent in terms of detail throughout the scenes. Samsung’s Note9 and S9 also sometimes can get a better shot, however they have too much of a tendency to overexpose. I think overall, the iPhone XS takes the lead in terms of smartphone photography in daylight just because of its consistent shooting experience.

Camera - Daylight Evaluation: Zoom and Scenic Camera - Low Light Evaluation

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name99 - Saturday, October 6, 2018 - link
If you're going to count like that, you need to throw in at least 7 Chinook cores (small 64-bit Apple-designed cores that act as controllers for various large blocks like the GPU or NPU).
[A Chinook is a type of non-Vortex wind, just like a Zephyr, Tempest, or Mistral...]

There's nothing that screams their existence on the die shots, but what little we know about them has been established by looking at the OS binaries for the new iPhones. Presumably if they really are minimal and require little to no L2 and smaller L1s (ie regular memory structures that are more easily visible), they could look like pretty much any of that vast sea of unexplained territory on the die.

It's unclear what these do today apart from the obvious tasks like initialization and power tracking. (On the GPU it handles thread scheduling.)
Even more interesting is what Apple's long term game here is? To move as much of the OS as possible off the main cores onto these auxiliary cores (and so the wheel of reincarnation spins back to System/360 Channel Controllers?) For example (in principle...) you could run the file system stack on the flash controller, or the network on a controller living near the radio basebands, and have the OS communicate with them at a much more abstract level.

Does this make sense for power, performance, or security reasons? Not a clue! But in a world where transistors are cheap, I'm glad to see Apple slowly rethinking OS and system design decisions that were basically made in the early 1970s, and that we've stuck with ever since then regardless of tech changes.
ex2bot - Sunday, October 7, 2018 - link
Much appreciate the review!
s.yu - Monday, October 8, 2018 - link
Great job as always Andrei!
I would only have hoped for a more thorough exploration of the limits of the portrait mode, to see if Apple really makes proper use of the depth map, taking a photo in portrait mode in a tunnel to see if the amount of blur is applied according to distance for example.
Mic_whos_right - Tuesday, October 9, 2018 - link
Thanks for this comment--Now I know why nothing last year. Great Anandtech standard of a review! Always above my intellect of understanding w/ info overload that teaches me a lot of the product.
Moh Qadee - Thursday, November 1, 2018 - link
Thank you for this great detailed review. I have been coming back to this review before making a purchase. Please make an comparison article of Iphone XS gaming vs other smartphones in market. How much does thermal make difference over longer periods before it starts to throttle or heat up. Would be able to give an approx time before you noticed heat while gaming on XS? I don't mind investing in an expensive phone as long as thermals doesn't limit the performance. There are phones like Razor 2 or Rog out. People make an comparison with an iPhone as it doesn't require much cooling. I wonder if gaming for above 20+ mins makes it challenging for Iphone to heat up enough that you should be worried about?
Ahadjisavvas - Monday, November 19, 2018 - link
And the exynos m3 had 12 execution ports right? Can you elaborate on the major differences between the design of the vortex core in the a12 and the meerkat core in the m3? I would deeply appreciate it if you could.
Ahadjisavvas - Monday, November 19, 2018 - link
And the exynos m3 has 12 execution ports right? Can you elaborate on the main differences between the design of the exynos m3 and the vortex core,that'll be really helpful and informative as well. Also,are you planning on writing a piece about the a12x soc, it'll be really interesting to hear how far apple has come with the soc on the 2018 ipad pro.
alysdexia - Monday, May 13, 2019 - link
"Now what is very interesting here is that this essentially looks identical to Apple’s Swift microarchitecture from Apple's A6 SoC."
This comparison doesn't make sense and it seems like you took the same execution ports to determine whether the chips are identical, when the ports could be arbitrary for each release. Rather I took the specifications (feature size, revision) and dates of each from these pages: https://en.wikipedia.org/wiki/Comparison_of_ARMv7-... and https://en.wikipedia.org/wiki/Comparison_of_ARMv8-... to come up with these matches: Cortex-A15-A9 A6, Cortex-A15-A9 A6X, Cortex-A57-A53 A7, Cortex-A57-A53 A8, Cortex-A57-A53 A8X, Cortex-A57-A53 A9, Cortex-A57-A53 A9X, Cortex-A73 A10, Cortex-A73 A10X, Cortex-A75 A11, Cortex-A76 A12, Cortex-A76 A12X. For exemplum 5 execution ports could be gotten (I'm no computer engineer so this is a SWAG.) from the 3 in Cortex-A9 subtracted from the 8 in Cortex-A15 but the later big.LITTLEs with 9 and 5 ports could be split from 7 or 8 as (7+2)+(7−2) or (8+1)+(8−3). You need to correct the Anandtech and Wikipedia pages.

faster -> swifter, swiftlier
ISO -> iso -> idem
's !-> they; 1 != 2
great:small::big:lite::mickel:littel
RSAUser - Friday, October 5, 2018 - link
I still don't like iOS tendency towards warmer photos than it is irl.
DERSS - Saturday, October 6, 2018 - link
It is weird because it is warmer in bright light and bleaker in dim light.
Why can not they just even it out, make the photos less yellowish in bright light and less bleak in dim light?

The iPhone XS & XS Max Review: Unveiling the Silicon Secrets

Camera - Daylight - More HDR & Portrait

Portrait Mode

Daylight Conclusion

Post Your Comment

253 Comments

View All Comments

name99 - Saturday, October 6, 2018 - link

ex2bot - Sunday, October 7, 2018 - link

s.yu - Monday, October 8, 2018 - link

Mic_whos_right - Tuesday, October 9, 2018 - link

Moh Qadee - Thursday, November 1, 2018 - link

Ahadjisavvas - Monday, November 19, 2018 - link

Ahadjisavvas - Monday, November 19, 2018 - link

alysdexia - Monday, May 13, 2019 - link

RSAUser - Friday, October 5, 2018 - link

DERSS - Saturday, October 6, 2018 - link

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