guidebook/docs/custom-doodads/edit-external.md

Drawing Doodads in an External Program

Doodad sprites can be drawn using any image editor and saved as .png files (with transparency). You can then create a doodad file from your series of PNG images.

Most of the built-in doodads that ship with the game were created in this way.

Create a Doodad from Images

Save each frame of your doodad as a separate PNG image and then use the doodad command-line tool to convert them to a .doodad file.

# Usage:
doodad convert [options] <inputs.png> <output.doodad>

# Example:
doodad convert door-closed.png door-open.png door.doodad