Film profiling is the process of determining the precise color characteristics of color negative film. To do this, you need to take a picture of an IT8 target and scan this frame. Make sure the picture is rectangular on the film.
You can obtain an A4-sized camera target from:
Wolf Faust: http://www.targets.coloraid.de/To profile your film with an IT8 target:
If you've previously made an ICC profile for a roll of film, you only need to do the following:
VueScan normally reads and writes the ICC profile for film using the file film.icc. Alternatively, you can type the file name of the ICC profile into Color | Film ICC profile.
Every IT8 target has an associated data file that describes the exact color of each square in the target. You can select this file by clicking on the '@' button next to Color | Film IT8 data.
Both the .icc and .it8 files are normally located in the folder described by Output | Default folder.