I second that. G'MIC has an impressive bunch of built-in commands to manipulate images, see e.g. the examples shown in the reference documentation (click the fi

I second that. G'MIC has an impressive bunch of built-in commands to manipulate images, see e.g. the examples shown in the reference documentation (click the first magnifying glass, then use right arrow on the keyboard): http://gmic.eu/reference.shtml#subsection15 http://gmic.eu/reference.shtml#subsection15 And as the commands are built-in, no needs for external scripts, those effects are available from any interface using the `libgmic` API (including C/C++ programs).