Avision AV810C+ - Manual (Page 39)

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Contrast: Adjusts the range between the darkest and the lightest
shades in the image. The higher the
contrast, the bigger the different gray scales.
Decrease your Contrast Normal Increase your Contrast
Gamma: Adjusts the midtone of the image without losing details
of the lightest and the darkest areas.
Gamma Value: 1.0 Gamma Value: 1.4 Gamma Value: 2.0