Vivotek PT7135 - Manual (Page 39)

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Image Settings
Click on this button to pop up another window to tune “Brightness”,
“Contrast”, “Hue” and
“Saturation” for video
compensation. Each field
has eleven levels ranged
from -5 to +5. In
“Brightness”
and
“Contrast” fields the
value 0 indicates auto
tuning. The user may
press
to
fine-tune the image.
When the image is O.K.,
press
to set the
image settings.
Click on this to recall the
original settings without
incorporating
the
changes.
User's Manual - 
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