NEC SpectraView II Guia Del Usuario página 51

50 | NEC SPECTRAVIEW II - USER'S GUIDE
the value that the sensor perceives into the White Point. Save this as a new Target.
5. Recalibrate display #2 with this new Target. From now on always use the respective Target to calibrate each
display.
Question 4: I'm trying to match my display to my prints in order to soft proof, however after calibrating using a standard
Target white point such as D65 or D50, the screen still appears too pink/magenta/green compared to the print. What
can I do to make them match?
Answer: Depending on many factors such as the lighting conditions used to view the prints, paper type, and the
printer profiles used for the soft proofing, the display white point may not visually match that of the paper. It is important
to remember that the preset white points such as D65 are not magic numbers that must be used regardless. The
calibration Target white point can be adjusted as necessary in this scenario. This is especially true if a standard viewing
environment such as a light box is not being used to view the prints.
Adjusting the white point using a Kelvin or Daylight value alone is adjusting the white point along the fixed Black Body
curve as viewed on a CIE xy diagram, and can vary the white point from cool to warm.
However, the color cast between the print and display may be at right angles to this curve, so in this case no Kelvin value
will be able to fully compensate. A white point that lies off the standard Black Body curve can be entered by specifying
it in terms of CIE xy instead of as a Kelvin or Daylight value.
To get an idea of how CIE xy values relate to the actual White Point color, try zooming in on the Color Gamut diagram
on the Information window. In the example below, the Black Body curve is shown. If for example the display appears to
be too green, then the white point should be moved slightly towards the lower right - this corresponds to increasing the
CIE x value, and decreasing the y value slightly. Modify the Target White Point values by making small adjustment (for
example increments of +/-0.003) and recalibrate the display. Several iterations may be required to find the best values.
In addition to this method, the Visual Match tool described in the previous answer can be used to interactively find a
visual match between the print and display.
Black Body curve