Quote Originally Posted by interneg View Post
Just to annoy those blathering on elsewhere in this thread about IT8's etc, it's possible to match a colour checker (even from an Ektar neg - allowing for the saturation difference!) from a Flextight scan without too much trouble.
Why would you want to annoy anyone posting here

IT8.7/2 is for reflective materials to calibrate for the dyes in the print, which are designed on purpose to work under a wide variety of illuminates in the first place so perhaps good enough compared to a macbeth chart which is designed specifically for colorimetric purposes. IT8.7/1 is for transmission targets were the illuminant is more critical, and the dye sets are more likely to suffer from Metameric failure when using the wrong illuminant, they trade this for greater saturation and gamut. Metameric failure is the main reason you need a target with the correct dye set.

No ones arguing that these targets are not useful, and it is possible to match something that already exists like a negative if you take colormetric measurements of the negative, but it is not quite as easy to match something that does not yet exist such as the resultant print. The calculations and methods being largely proprietary.