Visioneer 9750 Installation Guide download pdf (Page 52)

48 VISIONEER ONETOUCH 9750 SCANNER INSTALLATION GUIDE

HIGHLIGHT/SHADOW LEVELS

Images have light and dark areas. The highlight is the lightest spot on an

image; shadow is the darkest spot. The range of colors between the

highlight and shadow determines the range of colors of the image.

Using the Highlight/Shadow Levels features, however, you can extend

the original range of colors between the highlight and shadow to reveal

more details in the midrange colors.

To adjust the highlight and shadow levels:

1. Click the Highlight/Shadow button.

The dialog box that opens shows a histogram of the saturation,

gamma, and hue (S, G, H) of the range of colors for the highlight

and shadow.

Saturation is the strength or purity of a color, gamma controls the

brightness of the midtones of the color, and hue is the color your

eyes see as reﬂected from the image. The gamma setting in this

dialog box is in conjunction with the hue and saturation but you

can also set gamma by itself for an image. See the section “Curves,”

below for more information

2. From the Channel drop-down list, choose RGB to adjust all the

channels together, or choose a single channel if available.

3. Enter new settings in the boxes for the three levels, or drag the

small triangles at the bottom of the histogram.

As you change the settings, the histogram changes to reﬂect the new

levels.

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Visioneer 9750 Installation Guide Page 52