How to....
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How to use brightness, contrast and luminance
adjustments
Although they may seem very similar, there is quite a difference
between brightness, contrast and luminance adjustments.
•
Luminance
adjustment leaves the video signal untouched but
changes the light intensity of the backlight behind the LCD panel
inside the display.
• When controlling
brightness
, all video levels from black to
white are adjusted. You should adjust brightness to make the
black parts of the image perfectly black. But watch out not to
decrease brightness too much (avoid losing information in the
dark parts of the image).
• When controlling
contrast
, the black level remains constant and
the white levels are adjusted, changing the luminance
difference between black and white. You should adjust contrast
after brightness has been adjusted, to make the white parts of
the image perfectly white. But watch out not to increase
contrast too much (avoid losing information in the bright parts
of the image).
Important
:
If you adjust brightness and contrast incorrectly, clipping of
the video signal may occur: When brightness or contrast is too high, you
may lose information in the bright parts of the image because the image
is too bright. When brightness is too low, you may lose information in the
dark parts of the image because the image is too dim.
Some suggestions:
• If you experience the image is too dim, increase the contrast so
that no clipping occurs (no information lost in the bright parts).
Next, increase luminance slightly, if desired.
• If you experience the image is too bright (clipping occurs in the
bright parts) decrease contrast until the clipping is solved.
Luminance adjustment will not have any effect here.
