Kodak 35 mm Transparency
Used to profile positive film scanners, particularly if you use 35 mm film most often. 

IT8 Input Targets are the industry standard, and are needed to create profiles for scanners.

Every IT8 target is matched with a "reference file" -- a computer data file that contains the numerical values for the exact colors used in the target. Because your profiling software must compare the colors from the target with the reference file, it's important to be sure you're using the reference file that matches your target.