## Limitations

Some features that have been often asked for, but aren't currently implemented are:

- ICC Version 4 profile support
- Monochrome profiling support
- More than 4 colorant printer support
- GUI interface
- Support for all available instruments

Some of these features are being worked upon, and some are beyond the scope of a non-commercial project. The range of instruments supported is mainly limited by the availability of information on their interfaces, as well as the instruments themselves.
The file ttbd.txt in the source distribution has a longer and more detailed list of feature ideas.