There are several methods to extract/mask objects or persons from the background. But sometimes you need perfect masking that includes for example the hair of a woman. The method we use for this is called highpass. We need to simulate this filter because there is no filter in GIMP that does this for us. The point of the technique is that you'll save lots of time for the difficult hair part, because when you do everything right the hair is extracted automatically.
In this GIMP tutorial you'll learn some techniques to remove the background from an image with hair. Cut out hair. We're explaining step by step in this "How to in GIMP" so you'll know how to make a cut out of an image with hair.