Barco OVERVIEW D 50" Installation Manual page 83

There are transformation algorithms between the different color spaces. CAST allows to
switch between the presentation of the coordinates in the u', v' color space (CIE 1976)
and the x, y color space (CIE 1931).
The DLP Engine itself only "knows" the x, y color space, and requires that the values are
entered as x, y coordinates.
Only experienced personnel should edit this dialog! There is a risk of severe damages!
Use CAST to do the color adjustment.
Due to the influence of the dimmer the values indicated by CAST and those listed on this
dialog might slightly differ.
Changes become only active if Enabled is checked and if the menu is left by pressing the Exit button on the IR
Remote-Control Unit.
8.5.4.2 White Peaking
After changing the White Peaking Value, the color adjustment has to be repeated!
The color correction model is only valid for one White Peaking Value setting!
Before setting the White Peaking value, some background information on the generation of white is required.
The color wheel incorporated in the DLP projection engine has 4 sectors: red ( R), green (G), white (W) and blue
(B)
"White" is generated by the primary colors, via the addition of full red, full green, and full blue. W1 = R + G + B
"White" is also generated by the white segment: W2 = W
"White" is also generated by the so-called spoke light recapture: If the DMD is left ON while the color segments
change, there are additional contributions of adjacent segments:
R+G G+W
R G
Spoke Light Recapture (SLR) = (R+G) + (G+W) + (W+B) + (B+R) = 2*(R+G+B) + 2*W = W3
In case the white segment and spoke light recapture are activated, the white output is boosted.
The White Peaking Factor is defined as the relation of "all whites" to the RGB-White:
OverView D 50" – DOC-3303-5 – installation manual – Revision 10 – September 2006
W+B B+R
Spoke light
recapture
R
W B
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September 2006 September 2006
8. Final Adjustment and Configuration
Time
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________________________ 8-15
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