The pxPixelate plug-in effect appears as if you reduce the resolution of your image, similar to the pixelate function in Adobe Photoshop. You may work in a proportional (locked) or disproportional mode.
To achieve a nice animated transition, tweak the Smoothness parameter so that the change between the different pixelation levels are smoother or harsher.
Note: This plug-in is located in: Plugins -> Shader -> PixelFX
Adjust the following parameters as required to achieve the required effect:
Lock X/Y (on/off)
X Size
Y Size
Smoothness
Supports pxColorWorks and pxStack plug-ins.