I have an all black kitten - it has a coat pattern underlying the tabby heritage it has, but this is extremely difficult to see, except on the face. Of course, the fur is anything but all black, it is shades of black to very dark brown, and reflective in some areas, duller in others. It is possible to make out some of the pattern in some photographs. How can I manipulate the image in The GIMP to emphasise the underlying pattern? Obviously, I will need to make several images to picture the pattern as a whole.