Thank you for you help Graeme and Sam. Here follows more info taken from ICC profiles. Do you know any free software that lets me compare several ICC gamuts in one nice plot? Spyder 3 express SN: 030197xx Instrument Version: sw 1.2/hw 4CL Software version: 4.0.1 All profiles obtained with out-of-the-box display settings. "Spyder software" is my measurement using the software that came with my Spyder 3 express "DispCalGui" is my measurement using the same calibrator but the GUI for ArgyllCMS "TFTCentral" is the "Dell U2711 Standard Profile" from the review at http://www.tftcentral.co.uk/icc_profiles/Dell%20U2711%20-%20Collection.zip "Nec271w driver" is from the Nec driver available at http://www.necdisplay.com/cms/documents/Drivers/PA271W.zip Using ICC Profile Inspector Spyder software DispCalGui TFTcentral Nec271w driver Illuminant: X 0.96420 0.96420 0.96420 0.96420 Y 1.00000 1.00000 1.00000 1.00000 Z 0.82491 0.82491 0.82491 0.82489 MediaWhitePoint Tag X 0.94728 0.82973 0.96420 0.95137 Y 1.00000 1.00000 1.00000 1.00000 Z 1.09006 1.13789 0.82491 1.08815 x 0.311878 0.279594 0.345702 0.313000 y 0.329235 0.336970 0.358537 0.328999 MediaBlackPoint Tag X 0.00133 0.00154 Y 0.00160 0.00148 Z 0.00182 0.00194 x 0.280000 0.310484 y 0.336842 0.298387 RedColorant Tag X 0.65756 0.59038 0.53729 0.60602 Y 0.30211 0.26930 0.21552 0.27550 Z 0.00958 0.00632 0.00783 0.00694 x 0.678421 0.681732 0.706366 0.682102 y 0.311695 0.310970 0.283340 0.310087 GreenColorant Tag X 0.17140 0.24095 0.28874 0.21756 Y 0.65845 0.69295 0.73769 0.67461 Z 0.10768 0.11308 0.07498 0.08890 x 0.182821 0.230138 0.262155 0.221758 y 0.702324 0.661856 0.669769 0.687627 BlueColorant Tag X 0.13524 0.13287 0.13817 0.14064 Y 0.03944 0.03773 0.04680 0.04996 Z 0.70763 0.70551 0.74210 0.72908 x 0.153279 0.151659 0.149039 0.152923 y 0.044701 0.043065 0.050482 0.054323 rTRC gamma = 2.2 256 points gamma = 2.2 gamma = 2.2 gTRC gamma = 2.2 256 points gamma = 2.2 gamma = 2.2 bTRC gamma = 2.2 256 points gamma = 2.2 gamma = 2.2