These scripts scan the pixel data of an existing painting in a server and recreate it on your own canvas.
The game often adds a specific icon to art it identifies as scripted or "printed," which can make it harder to sell to experienced collectors.
Place a distinct, semi-transparent watermark over different colored sections of your art to make it harder to clone cleanly.
If you're an actual artist in the game, you can defend your work from scripts:
If you see someone cloning your work in real-time, use the in-game report feature or contact community moderators. Roblox Starving Artist Script Guide | PDF - Scribd
Some versions allow you to upload an image from your computer or a URL, which the script then "paints" for you automatically.