Tape a large sheet of blank white page to a wall. Place the light source so that it shines directly onto the paper.
Position the subject of the silhouette so that his shadow is cast onto the paper, exactly where it should be placed in the final piece. Use the subject's outline to capture a jazz movement, such as tilting a jazz instrument. Make sure that there's enough room at the top and sides of the paper to capture the full form. Have the subject lock into that position for as long as possible.
Trace the outline of the shadow onto the paper using a pencil. Stand so that your own shadow doesn't effect the area of the silhouette that is being drawn at that moment. If possible, capture the entire form in a quick but detailed manner so that the subject doesn't have to lock in one position for too long. Fix the subject's position when necessary.
Finish tracing the shadow and take the paper from the wall. Remove stray lines from the paper with an eraser (gum erasers in particular remove marks from the paper rather than removing paper).
Fill in the shadow outline with black marker or black paint. Other features, such as white clothing patterns or accessories, can be added as wanted while filling in the shadow.
Position the subject of the silhouette so that his outline captures a jazz movement, such as tilting a jazz instrument. Make sure that there is a strong enough light to emphasize the subject's shape. It's best to have the subject pose in front of a blank white wall for the highest contrast or to position a light directly behind the subject; however, neither step is required because the background and interior details will be cut away.
Take a digital picture of the subject in his jazz position.
Open the picture with an imaging program, such as Photoshop or GIMP.
Use the program's tool to create an outline of the background of the subject's shadow in the photograph--everything that isn't contained in the shadow itself. The exact tool depends on the program that you use, but most image programs will allow for outlining. Select "Edit" and "Cut" to remove the background from the image.
Locate the "Desaturate" option within one of the program's menus; it's commonly included in either "Image" or "Colors," depending on the exact program used. Desaturate the image so that the colors within the shadow decrease. Adjust the "Contrast" and "Brightness" of the image as needed to bring out the shadow more.
Use the flood fill or brush options to fill in any places within the shadow which aren't completely black.
Save the image. Print out as necessary.