NEC SpectraView Reference 241 - No Calibration (Profile Only)

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Proler
User Manual
4.4.3 No calibration (profile only)
In the worst case the graphic card does not support video LUT download
(some PC graphic cards). The monitor must then be characterized in it’s
present state. Corrections for color temperature and tone curve are not
available in this mode. Also, adjustment of luminance and contrast can
only be done manually.
SpectraView Profiler supports you with measurement values in setting
these parameters.
Should the graphic card contain a LUT when launching SpectraView
Profiler it will be taken over and saved in the ICC- profile.
It is understandable that the results achieved with this method are far
from being optimal.