Vivotek FD7131 - Manual (Page 45)

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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 ranging 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 to recall the
original settings without incorporating the changes.