Problem with display 4k images

Zidoo Z9X cannot display 4k images with bit perfect quality (without rescaling). Huge quality loss occurs.
Checked with 6.4.35 software too. Below are examples of showing pictures by internal TV viewer and by Zidoo:

 

Not sure what it is, but you're doing something wrong - probably in the display.

There's nothing wrong with the output geometry assuming you've not messed with the picture scale settings..

 

It's sharpness test board with resolution 3840x2160 px. In Zidoo I've tried to manually switch resolution to 4k but it didn't help. As you can see on second attached picture it's fuzzy an softened. It' should be displayed as sharp as on first attached picture (displayed by TV internal player).
Attached pictures are taken by external camera.

 

What are the settings in your display for that specific HMDI input? Make sure there is no sharpening or other “enhancements” enabled.

 

Ok. I will check it later and describe.

 

Here are setting:

 

It's definitely problem with displaying images. It looks like Zidoo makes downscaling pictures to 1080p resolution an then upscales them again before displaying. If i play 4k sharpness test movie then it's perfect with great sharpness

 

Did you check HDMI settings of your Tv?
What does Zidoo report as the output resolution? (Press info while playback)
What does your Tv report as input resolution?

 

What does it say under the “resolution” setting?

 

I don't think is HDMI issue. When playing 4k video file problem is not present.
In info screen resolution is 3840x2160.

 

Markswift2003. Do you know if problem with displaying 4k images on 4k output will be fixed? or maybe it won't be fixed at all? Additionally Zidoo introduces other quality degradation to displayed image which I described on this post: http://forum.zidoo.tv/index.php?threads/hdmi-levels-doesnt-work-correctly.94548/#post-183094. It's embarrassing that simple picture viewer from TV has much better Picture Quality for graphics files than Zidoo with much more powerful CPU/GPU.

 

You're right, Image Viewer only resolves to 1080p and it, yes, to be perfectly honest, it does it quite badly.

But that's just a shortcoming of the app, not the box.

As to whether the app ever gets upgraded to show 4K, who knows - this device is ostensibly a video player so I wouldn't hold out much hope!

There are probably other apps available for viewing images but I've never looked as it's not something I'd ever use the box for.