These files correspond to Figure 15-16 in the book. Using the Convolution Matrix filter, you can replicate the effects of most of GIMP’s other filters or create your own filtering effect. A simple Internet search can get you started with a variety of convolution matrices for you to play with. The image to the left shows just a few examples. Use the image listed below to try your own Convolution Matrix values. Photo credit: Melody Smith, www.twilightimages.net, used with permission.