Procedure
Click the [Clor Correction] button.•The threshold panel is displayed in the Color Correction dialog box.•You can also click on the [Image] menu and select [Color Correction] to open the Color Correction dialog box.
Set the threshold.The value set with the slide bar is displayed here. You can also enter a value (0 to
127)directly into the entry box without using the slider.
Drag the button right or left, or click the left or
right arrows 
to set the value.
Click on the [OK] button.
The changes will be reflected in the preview image.
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