Fixed size canvas in pixels

Hi all!
I try solve one problem with new gui.
Suppose designer prepared own design to the 1920x1080 screen. And now I need to impose his pretty design exactly pixel by pixel. How to set canvas to fixed size in pixels? It guaranteed that screen resolution will not change for my application. Thus I really will run my app at the 1920x1080 screen computers, not at another 16:9 screens...

Dilemma: I can't change canvas resolution directly in "Screen space - overlay" and "Screen space - camera" mode! Also I tried so: set canvas child of camera in "World space mode", but I think it's bad idea.

Any ideas? How does It works in pixels? How I can get really size of element in pixels?

 

When in Screen Space Overlay mode, the Canvas will always be the exact size of the screen in pixels. If your game is running 1920x1080, that is the exact size of the canvas, and all your designer's art made for that resolution will be pixel perfect. To me, it seems like there's not actually a problem, if your game is always running at a guaranteed resolution.

I have a feeling that your real problem is that you are not seeing things this way in the editor? That is, your 'game' window in the Editor is not 1920x1080 (and probably can't be made that big), so everything looks wrong. If this is correct, then your solution will be to add a Reference Resolution component to the canvas. This will make the UI behave as if it's always at 1920x1080, even if the display/window being used is not. It should help your development process of the app.

 

Yes It is my problem.
I'm trying do this but it looks like bug(image). White images size is 1080x1080. But screen is 1980x1440

 

No, it's not my problem. I want to develop 1920x1080 screen apps in unity editio but i dont know how set screen to this resolution and how to check whether elements are needed size in pixels.

 

yup it seem funny that the editor will use the actually editor game window size to scale the canvas in the editor. and because of the window borders even if you expand it to full, it would have some werid resolution like 1826x1027 and that make creating pixel prefect texture a headache without a higher than 1920x1080 monitor.

as a compromise i drag the game window out of the editor and fixed it dimension to 960x540. so what ever is the size of the UI i create in the editor, i know i can just 2x the value when i make the texture for it. it not a major issue, it just a pain in the butt that that editor doesn't show you the ratio for a given resolution.