Images originating from different media and devices, such as digital cameras or scanned film, have different colour characteristics. On import, you can apply an Input LUT to convert them all to the grading working space prior to the grading process. Unlike LUTs applied for viewing, Input LUTs change the underlying colour values of the pixels.
If running the Windows version of Lustre, save print LUTs in the C:\Program Files\Autodesk\Lustre <version_number>\lut folder. If running the Linux version of Lustre, save print LUTs in the /usr/autodesk/lustre_<version_number>/lut directory. Lustre provides industry-standard 3D LUTs which are located in C:\Program Files\Autodesk\Lustre Color <version_number> in the Windows version and/usr/discreet/Lustre_Color in the Linux version.