This creates a file `<filename>.base64` containning a copy of the raw image data, then a sytsem shell is executed to convert the raw data to the binary image and a file `<filename>` is created, which is then include in your document.
**Note:** The LaTeX compiler must be able to execute system commands, so option `--shell-escape` is required.
**Note:** It is desiged for Unix systems and it requires the command line tool `base64` installed. Compilation calls `base64 -d <filename>.img.base64 > <filename>.img`.
If you are missing a feature or a configuration option, consult the [project] page. Just open a [ticket] and the [author] will care about it. Or extend it, it's [lgpl].