Cubic and gaussian blurs

Cubic blur

This is the most common blur effect: the more you increase the size parameter, the less the sharp and angular areas of the source image will be visible. It may also be applied only to the image's alpha channel.

Original: The photo The drawing

After applying the effect:

Gaussian blur

An image which a Gaussian blur has been applied on may be compared to an image seen through a camera that is not set correctly. This kind of blur effect gives a sharper result than the Cubic blur.