Blur tool

The blur tool can be used to apply localized blurring to a photo, soften portions of an image, or smooth over-sharp edges in an image or alpha channel mask. The blur tool options are shown below in Figure 1. The Sample All Layers option is useful if you wish to carry out work with the blur tool on a new empty layer, sampling the pixels from all currently visible layers. For example, you can create a new empty layer at the top of the layer stack and if the Sample All Layers option checked, use the blur tool on the empty new layer to achieve the effect you are after but without degrading the image data that is on the layers below.

Figure 1 The Blur tool Options bar.