Unsharp mask

This filter sharpens images by enhancing the contrast at the border between colors.

1On the [Layer] palette, select a layer.

If you create a selection area, the filter will only be applied to the selection area.

2Select the [Filter] menu > [Sharpen] > [Unsharp mask].

3Set the [Unsharp mask] dialog box.

(1)  Set the strength of the effect, threshold value, and so on.

(2)  Click [OK].

4The filter will be applied to increase the contrast  on the selected layer at borders between colors.

[Unsharp mask] Dialog Box

(1)  Radius

Set the size of the effect.

(2)  Strength

Set the strength of the effect.

(3)  Threshold

Set a minimum level of difference in values between adjacent areas to be recognized as different colors.

A higher value detects fewer borders between colors.

(4)  Preview

Turn this on to preview the results on the canvas.