I know the screen can be zoomed on PI VISION. But how to set the resolution of Pi vision ? thanks a lot.
What exactly do you mean with resolution?
The resolution a display requires is set by the objects placed most bottom and most right of the screen.
A way i used in the past to ensure all displays were created equal was to place a ruler / marker / rectangle on the display that would set the resultion required (e.g. 1980x1024). After building the display i would remove this again.
PS: The zoom and fit all functions can make a display with a larger size fit a smaller screen
Thank you very much.
I want to use the picture as a background. If I stretch the picture to cover the screen. the picture will be out of shape. How to set the picture size? Thanks a lot.
If the original picture is smaller than you need, you first need to stitch together a background picture to the desired size. You can use some tools like this one: Zippy Photo Stitcher or do it manually in a photo editor.
Unfortunately PI VIsion does not support this natively and only supports stretching the picture (in a quite cumbersome way).
I don't konw the size of screen. So I don't know how to crop the picture to match the screen. I stretch the picture to cover the screen. but when I click FITALL. White edge will appear on the screen.
You need to know the exact resolution of the screen, and subtract the "chrome" on top: the size of the menubar on top. Then you need to create a picture with the right size and you would not need to use fit all. Fit all only does dimensional zooming, and as you see in your example the aspect ratio of the picture is not the same as your display: you need a wider picture.
A typical display is 1920x1080 nowadays. Depending on your browser or window settings, but i typically work with a usable display size of 1900x1000. So your picture must be approximately that. Do note this will never be exact, depending on settings on a specific computer more or less space might be available, but this should work OK. Choose a display background that matches your picture background color to further hide the remaining space left.
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