Avision AV100III User Manual

4-54.3 Image ControlBrightness: Adjusts the lightness or darkness of an image. Thehigher the value, the brighter the image.Contrast: Adjusts the range between the darkest and thelightest shades in the image. The higher thecontrast, the bigger the different gray scales range.Gamma: Adjusts the midtone of the image without losingdetails of the lightest and the darkest areas.Highlight: Adjusts the highlight area of the image.Shadow: Adjusts the darkest area of the image.Channel: Used along with the five functions above, thisfunction enables you to select RGB for Red,Green, or Blue filter to display the color image theway you desire.Color Filter: You can select None, Red, Green or Blue filter forcolor drop out purpose when in line art / halftone /error diffusion / gray mode. For instance, a textwith a red background color hampers the reading.In this case, then, you can select RGB for the Redfilter to drop out the background color andfacilitate the reading.BrightnessShadowGammaHighlightShadow