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Adjust highlights, midtones, and shadows with Levels
Select the bitmap image.
Do one of the following:
In the Property inspector,
click the Add Live Filters button, and then select Adjust Color >
Levels from the Filters pop-up menu.
Select Filters > Adjust Color > Levels.
 Levels dialog box  To view
your changes in the workspace, select Preview in the dialog box.
As you make changes, the image updates.
In the Channel pop-up menu, select to apply changes to individual
color channels (Red, Blue, or Green) or to all color channels (RGB).
Drag the Input Levels sliders under the Histogram:
The right slider adjusts the highlights using values from
255 to 0.
The center slider adjusts the midtones using values from
10 to 0.
The left slider adjusts the shadows using values from 0 to
255.
Note: The shadow value cannot be higher than
the highlight value; the highlight value cannot be lower than the
shadow value; and the midtones must fall between the shadow and
highlight settings.
Drag the Output Levels sliders to adjust the contrast values:
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