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@RoboticBot wrote:Bjorn,
Thanks for your help!
Here is the background for the question:
I need to upload photographs I've taken (using Sony Alpha cameras) to display in highest resolution to show my photographic work when 'on the road.' I've not had a Sony phone previously, but the 4K resolution (and the fact that I'm using 3 Sony Alpha cameras in my work) have encouraged me to look into using the XZ Premium to show my work out on location.
But since I'm totally unfamiliar with the Apps that the XZ Prem. uses to show photos, I want to be sure that I can use the Album app or a Video app to effectively to do this - and in 4K.
Here's a bit more info - I may use a VR type viewer (like Google Cardboard, but much improved optics and enclosure) to help view the photographs on the phone, so the 4K resolution would be very important. These VR viewers divide the picture in half, and it halves the resolution - so 4K is needed to still have a high resolution for each eye. I've tried doing the above using some of the recent Samsung and LG phones, and they already look great, but the Sony at 4K would likely look incredible. And with a VR viewer attached, I may need a separate app to be able to select the photos (go forward / reverse in order, etc.). So if other apps could also be used in 4K, I'd know I can use it this way if needed.
I do like automated features, but almost always find that, if I can turn off the automation - even at the expense of faster battery consumption - I always prefer having that possibilty. Example: I always like to manually control my screen brightness, because it is never 'quite right,' for the situation. "Automatic" always sets it to a 'reasonable' brightness, and probably saves battery power, but I need to be able to set brightness to the perfect setting for my own needs. If 4K consumes much more power, I'd still like to be able to decide when it's worth the trade-off. And if it is that it may become too hot, then a warning would be needed, or a temporary shut off to protect the phone.
If you are still reading, I'll ask one further thing: Is the XZ Prem.'s display likely to have much 'burn-in,' similar to the older Samsung OLED's?Sorry if I gave you too much information, but wanted to be more clear.
Thanks for your assistance, and I'm hopeful the XZ P will be the perfect phone for my needs!
- Randall
@RoboticBot
Lcd doesn't get oled burn in like on Samsung, it's one reason I prefer lcd.
As for camera compatibility, luckily the Xperia Album app supports viewing the ARW raw file format produced from Alpha cameras, as well as DNG, PNF, JPG, and quite a few others.
On loading the image, the app changes to 4k and shows the image at maximum resolution, you will be impressed, I'm sure
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I see that @Viridis have already done a great job answering most of your questions.
It's nice to hear that photographers find that the quality and high resolution of the Xperia XZ Premium display can help them in their work.
@RoboticBot wrote:So then it can use files from outside sources (like from a Sony alpha camera, if exported in the right file type)?
And these files can be used in the Album app on the XZ Premium displayed in 4K mode?
Yes and yes! 
@RoboticBot wrote:So would sizing a jpg to the exact resolution (2160 x 3840) of the XZ P screen make this a fast process, and display the high-rez image quickly, if no interpolation in resolution is needed?
I will look into this one. So far I have not experienced any performance problems when loading 4K images taken with the camera.
About the VR usecase. You will be able to watch VR videos, such as Youtube VR in 4K resolution. Currently I think VR still images is not supported by Xperia Album. When images are viewed in for example Googles Cardboard Camera, the 4K mode is not active.
Using 4K resolution for image viewing in VR is a great idea and I'll suggest internally that the use-case is reconsidered.
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