The recommended resolution for images is 1920 x 1080.
The recommended size is no bigger than 1MB.
This will allow ClickHome to display the image on the screen in any ClickHome user interface as well as use it in reports, without causing size issues when loading pages or sending PDFs via email.
The below sample image is 381KB and 1920 x 1080 pixels.
These details are found by looking at the size of the file in Windows file explorer;
Or right clicking on the file and going to Properties > Details to see the dimensions;