The phrase "single image" refers to a picture or photograph that portrays only one scene or subject. It is not a collection of multiple pictures combined together. Full definition
There is a beautiful, digitally - generated black - and - white single image of the oak on the outside of the projection room. (sfaq.us)
In combat, your foes are represented by single images with no animation frames and only the most minimal of effects to represent physical or magical strikes. (tech-gaming.com)