Am 21.06.2011 20:42, schrieb Knut Inge:
Should the Spyder 3 correction curve ideally be 7-channel (as it is a 7-channel native sensor), or is it sufficient to do correction of the 3-channel default mix of those?
Combining 7 channels to XYZ would basically require a 7x3 matrix. While a 3-channel sensor with a 3x3 correction matrix is only valid (accurate) for a single display model, a 7-channel sensor in conjunction with a 7x3 matrix can simultaneously be valid for two different display models with unrelated spectra of their primaries (granted that the sensor sensitivities have been carefully selected). Note that we have to distinguish between the internal, built-in correction matrix of the instrument, and an Argyll ccmx correction matrix. A ccmx is applied in addition to the built-in matrix of the instrument. It is still a 3x3 matrix even if the device had 7 channels and the internal matrix of the instrument was a 7x3 matrix. Regards, Gerhard