On the Paradise Island wikia, some of the Category thumbnails display the main picture on the page and some seem to grab another random picture. Also, some of them display the image with a black background and some with a white background. Is there a good way to control this, either by setting up the referenced page better or through some control on the category thumbnails themselves?
A classic example is the Springboard thumbnail that shows up on Page 2 of this Category Section:
The thumbnail shows up as a document picture, not the png from the page.