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Barco - DCMS - User Manual _________________________________________________________ 31
Running the DCMS application
Select the ‘Color temperature’ radio button to define the white point in color
temperature and use the slider to set the desired color temperature between
3200 and 9900K. Note that daylight is typically 6500K. The selected color
temperature can be read in the text field on right of the slider.
For expert use, you can also give the desired white point in CIE1931xyY
coordinates. Figure below shows the CIE1931xyY color space. In this chart, all
color temperatures between 2000 and 10000K are also shown.
Figure 13: CIE1931xyY color space
Select the ‘CIE1931xyY’ radio button if you wish to set the desired white point in
CIE1931xyY color coordinates in the two text fields below, labeled ‘x’ and ‘y’. For
your convenience, the color temperature slider may still be used to set an initial
x and y value to start from. In the text field on the right, labeled ‘Tc(K)’ you can
read the correlated color temperature. Below this text field, a second text field
labeled ‘u’v’’ shows how far the entered x and y coordinates deviate from the
Planckian locus (this is the path that a black-body follows as it is heated). This
deviation is expressed in distance in the CIE1976UCS color space (which is a
color space that is proportional to human perception of color differences). Both
these text fields will color red if no correlated color temperature can be
calculated for the entered x and y coordinates.
Mid gray
For some applications (like color matching of displays) the mid* gray point can
also be defined. This setting is intended for expert use. The desired color
coordinates and luminance (in CIE1931xyY) of mid gray can be changed here.
*Mid gray in 3x8 bit RGB color space is defined here as (128, 128, 128)