Despite some minor issues, Picfx is a great app for adding effects to your images. It offers a simple way to browse effects from multiple categories and lets you stack effects and styles to give you a large number of possibilities.
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With Picfx, you can layer as many effects as you want, but there is a point when you're simply taking it too far.
Whether you want to add filters to your photos or adjust the finer details like color levels and saturation, we've got a collection of apps with all the right tools.