Threshold
The Threshold effect creates a black and white image.
Customized settings can be saved as a preset for future use. Presets can be selected from the Presets drop-down, or saved by clicking the adjacent Save icon.
To apply the Threshold effect:
- Select Filter | Add | Special Effects from the main menu, or press Shift + Alt + S.
- In the Effects dialog, navigate to the Artistic group.
- Select Threshold.
- Set the options as described below.
- Do one of the following:
- Click OK to accept your changes and close the panel.
- Click Cancel to discard your changes and close the panel.
Threshold Options
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Threshold |
The Threshold slider determines which pixels become black and which ones become white in a black and white rendering of the image. Any pixels that are brighter than the selected threshold will become white and any pixels that are darker than the threshold will become black. |
Right-click a slider to reset to the default value.
Use the Edit Brush to paint this effect onto specific areas of the image. 
Use the Gradient tool to transition this effect across specific areas of the image. 
Use the Radial Gradient tool to apply effects around, or directly to, a center point. 