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In page GIMP:

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GIMP operations can be automated with scripting languages. The Script-Fu is a Scheme-based language implemented using a TinyScheme interpreter built into GIMP.[1] GIMP can also be scripted in Perl,[2][3] Python (Python-Fu),[4][5] or Tcl, using interpreters external to GIMP.[6] New features can be added to GIMP not only by changing program code (GIMP core), but also by creating plug-ins. These are external programs that are executed and controlled by the main GIMP program.[7][8] MathMap is an example of a plug-in written in C.[citation needed]