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file:///C|/Documents%20and%20Settings/Miz%20B/My%20D...0UGTA/Nuvera%209.0%20UGTA_FINAL/English/iq_adj20.htm8/13/2008 2:22:26 PM
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About Lightness/Darkness
The Lighten/Darken control makes all tones lighter or darker.
Increasing Lightness/Darkness moves all tones in the image
toward white. Decreasing Lightness/Darkness moves all tones
toward black.
NOTE: When the Text Original Type with Threshold
Rendering Option is selected, the Lightness/Darkness
control adjusts the threshold value. Pixels lighter than
the threshold value become white, and pixels darker
than the threshold value become black. This often
creates the appearance of a contrast change.
Lightness/Darkness controls:
Lightness/Darkness controls, when set to extremes, may cause
loss of detail in shadows (darker areas) or highlights (lighter
areas). For example, Figure 1, to get more shadow detail in the
phone handset, move the Lightness/Darkness slider control to
the right, making the image brighter.
However, as you can see in Figure 2, while shadow detail is
gained in the telephone handset, much of the midtone detail in
the woman's face has turned completely white. While desirable
tonal correction enhances details at one end, the saturated
tones at the opposite end loose detail.
For details on working with the lightness/darkness control, see
Adjusting
Lightness/Darkness.
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Figure 1:
Figure 1: A dark original image. Notice how shadow detail goes to
black areas. Histogram data is justified to the left.
Figure 2:
Figure 2: Too much Lightness applied. Notice how some of the
highlight detail has gone to completely white. Histogram data is
justified to the right.
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