Blur

This transformation creates a blurred version of the current image. Images are blurred by replacing each pixel with a weighted average of its neighbors. The Blur transformation is useful for slightly softening an image – to get a stronger effect, use the Gaussian Blur transformation.

Amount

The amount control lets you control how much of the blur transformation is applied to the input image. You can apply a percentage of the transformation to the entire image, or you can specify an amount mask to restrict the effects of the transformation to only part of the input image.

Method

This control lets you choose the blurring method.

Blur -- works by averaging each pixel with its four nearest neighbors.

Blur More -- works by averaging each pixel with its eight nearest neighbors.

Threshold

Only pixels within the threshold value of the central pixel are used when blurring the image. The effect of the threshold is to restrict blurring to those areas of the input image that are already relatively soft and to leave pixels that differ sharply from others around them alone. This can be very helpful, for example, in smoothing out noise in a clear sky while leaving the adjacent tree line unblurred. A threshold setting of 100% enables full blurring – at 0% nothing is blurred.