Step 1 Open up GIMP and click file open and select your photo.
Step 2 Click on the 'fuzzy select tool'. Don't use it yet, we need to change the settings.
Step 4 This step is important. At the bottom of the 'fuzzy select tool' tool options it says "select by". Change this from 'Composite' to 'Hue'. Hue means color, because we want to select by color.
Step 5 Using the fuzzy select tool, click on the green screen. The fuzzy select tool should select all of the green. There will be some problem areas, and those will be fixed in the next step.
Step 6 At the top of gimp, press for the 'select' menu and then choose 'toggle quick mask'. The selected area will now turn red and we can now use the paint brush to select or deselect more areas.
Step 7 Select the paint brush and change the color from black to white by clicking on the arrow between the two colors (the colors are under the tools and above the tool options).
Step 8 Remove any unwanted red areas using the paint brush. Don't worry about being perfect right now, we will finish this later. In the tool options, change the size of the brush to a bigger size so that you can work more quickly.
Step 9 Change the color of the brush to black and paint any parts that you want to keep (even though you are using black, they will be painted red). After you are finished you can clean up using the white brush again.
Step 10 Use the zoom tool and change to a smaller brush to clean up the more difficult parts of the picture. You can press the space bar and move your mouse to help you move around the picture while zoomed in.
After a few minutes of cleaning up the picture you should be left with something like this.