[argyllcms] Re: Dell U2711 - is it any good?

  • From: Gerhard Fuernkranz <nospam456@xxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 23 Jun 2011 16:32:11 +0200

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 

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.


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