Grow node

Left Toolbar > Compose icon Compose Nodes > Grow icon Shrink node

The Grow node grows the bright areas of the image in X and Y. This tool works on the individual channels of the image. The channel value on a pixel is set to the maximum value on the region defined by radius x and radius y.

input
In0 Img

output
In2 Img
Image with a grow filter of 5 x 5 pixels.