It implements its own protocol (https://sw.kovidgoyal.net/kitty/graphics-protocol.html https://sw.kovidgoyal.net/kitty/graphics-protocol.html) to display images

It implements its own protocol (https://sw.kovidgoyal.net/kitty/graphics-protocol.html https://sw.kovidgoyal.net/kitty/graphics-protocol.html) to display images. This is something different from serialized OpenGL.