At balance the average brightness of every internal striped
rectangle is the same as the brightness of the area outside it.
You should achieve such brightness equality for the middle raw.
The top raw and the bottom raw are destined only for indication how accurate
is the balance at other luminance levels. It is impossible to achieve
the precise balance in the all three rows simultaneously
for some monitors and graphic cards.
It is desirable for black areas: the top internal
rectangle is not visible or is almost invisible, the central internal
rectangle is slightly visible, the bottom internal rectangle is distinctly
visible. Though in some monitors the internal black rectangles
are visible only if the brightness regulator is setted at abnormally high
position.
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