The effect is only applied to these channels.

If you set this to something other than all or none, you can use the checkboxes on the right to select individual channels.

Adjusts the size of pixels within the channel defined by the channels control. Values less than 3 increase the light pixels and vice versa.

Sets the filter algorithm to use:

• box

• triangle

• quadratic

• gaussian

Note:  Box is the fastest to render, whereas Gaussian blur is the smoothest.

Controls the level of filtering quality. Entering a low number runs the calculation more quickly, but the end result isn’t quite as smooth.

The image is scaled down during the calculation, so that the blur filter is no larger than this number, and then scaled up with linear interpolation after filtering.

When enabled, crop the resulting image to the format. If the bounding box is at or inside the format, don’t enlarge it past the format. This avoids creating oversized images that you don’t need.

Enables the associated mask channel to the right. Disabling this checkbox is the same as setting the channel to none.

The channel to use as a mask. By default, the effect is limited to the non-black areas of this channel.

Copies the mask input to the predefined mask.a channel. Injecting the mask allows you to use the same mask further downstream.

Inverts the use of the mask channel, so that the effect is limited to the non-white areas of the mask.

When enabled, only apply the effect to the edge of the mask.

When disabled, the effect is applied to the entire mask.