The checkbox in the Color Correction section of the RGB Control window toggles selective color on
or off. The Color Correction checkbox should always be checked.
The sliders in the Color Correction section allow you to perform color correction in the three sepa-
rate color channels. This is performed by clicking on the area of the image that you wish to adjust,
and then using the sliders to adjust the color.
Histograms
Another way to set the tonal range is by manipulating the image’s histograms. To do so, click on the
Histograms in the RGB Control window. The window displays the input density histogram and the
output reflectance histogram.
The input histogram can be adjusted to show all three RGB channels together or each channel
individually. To adjust the limits, slide the white slider (highlight) and/or black slider (shadows) to the
desired position.
The Output Reflectance histogram is a static display that cannot be adjusted. It is designed to show
how your adjustments will affect the image when output.
Minor adjustments to histograms have strong results. Move the sliders in small increments to
avoid distorting your range values excessively. Remember to update the image regularly to
view your changes.
UMAX PowerColor Quick Start Guide
RGB Expert Controls
11
Summary of Contents for PowerColor
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