Applying filters--especially to large images--can be time-consuming. Some filters let you preview the effect before applying it. You can then choose to apply the filter or cancel the operation without wasting time.

    If the dialog box contains a preview window, use the following methods to preview the effect:

    • If the dialog box contains sliders, hold down Alt (Windows) or Option (Mac OS) while dragging a slider to see a real-time preview (real-time rendering) of the effect.
    • Drag in the preview window to center a specific area of the image in the window.
    • Use the + or - button under the preview window to zoom in or zoom out on the preview
    • Click in the image window to center a specific area of the image in the preview window. (This may not work with all preview windows.)

    Some individual filters use dialog boxes to help you customize the filter effect. These filter names are followed by ellipses (...) so you can identify them.

To apply a filter:

  1. Do one of the following:
    • To apply a filter to an entire layer, make sure that the layer is active or selected.
    • To apply a filter to an area of a layer, select that area.
  2. Choose a filter from the submenus in the Filter menu.

    3. If no dialog box appears, the filter effect is applied.

  3. If a dialog box appears, enter values or select options, and then click the OK

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