Features:

Performance. The plugin inserts thousands of frames in just a few seconds (during testing, the plugin inserted ~3000 frames in 2 seconds)
Dithering. With dithering transitions look smoother and a small number of colors in the palette of maps becomes almost invisible.
Adaptive palette. The player will always see images with the palette relevant to his version, regardless of the server version.
Client-side. The frames are sent to the players directly and are never created on the server itself.
GIF support.
Glowing item frame support. Works on 1.17+ clients, regardless of the server version.

Commands:

/fi create
Inserts an image from the link on the block where the cursor points. (Frames go right and up)
/fi remove
Deletes the image that the cursor points to.
/fi reload
Reloads the config and all images

Permissions:

JNNGL

Floodfill Lights