qa.hlp (Table of Contents; Topic list)
Int 10H Function 10H Subfunction 1BH
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    For each color register, the weighted sum of its red, green, and blue
    values is calculated (30% red $PL 59% green $PL 11% blue) and written
    back into all three components of the color register. The original red,
    green, and blue values are lost.
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