This simple program generates thumbnails of digital camera raw image files using libopenraw and GDK. It supports the same file formats as libopenraw (http://libopenraw.freedesktop.org/wiki/FileFormats).

This thumbnailer is designed to be small, lightweight and fast. It is primarily intended to be used with file managers (although it could easily be used by a photograph management program) and is used by thunar-thumbnailers.

Usage: raw-thumbnailer -i input_file -o output_file -s size

See also, ffmpegthumbnailer: an excellent thumbnailer for video files.