Sorry for my unclear description
I mean the image on the right side of the screen if a folder with a folder.jpg is selected on the left.
I have created some images (cover with some lines of plot outline) to be displayed when I select a DVD folder. That works fine so far, but the images were 900x800 px and were resized to... whatever (half size ?). However, the text was unreadable.
The screen size is 1920x1080.
I just too lazy to get the right resolution by trial and error...