The Glass filter allows you to make the image appear as if it were being viewed through glass.
Choose Effects > Distort > Glass
Use the following options:
This option allows you to change the square size.
Min = 1, Max = 200, Default = 16.
Using Preview Windows
Favorites and History
Effects > Artistic > Stained Glass
Effects > Stylize > Broken Glass
Effects > Stylize > Frosted Glass
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