Remote-control a running GIMP (the open-source image editor) by Python script through its built-in Script-Fu server — build documents and layer stacks, fill, gradient and brush-stroke drawables, add text layers, attach non-destructive GEGL filters, cut out with masks and selections, retouch photos, and export PNG/JPEG/TIFF/GIF/.xcf or batch-convert whole folders in the session the user is looking at.