Even though the Chroma key technology has been in use since the mid of the 1990s, the fundamentals of using the green and blue screen kit still scares many photographers. People, who are not involved in this form of photography, often find it very difficult to get good results. The truth however, is that Chroma key techniques are as simple as any other technique that is useful for an amateur. Here are some important guidelines that will maximize your Chroma keying efforts.
Visualize your end:
The best way to start your blue screen shoot is to visualize what you want at the end. Think what background you will use after removing the blue backdrops. This will help you to adjust your lighting as well as your camera settings. If you are planning a picture that will show your subject walking on the ramp or on a sunny beach, make sure you give your subject a bright golden look. If you want your subject inside a museum, give a slightly darker look to him/her. The better you visualize and plan your event, the easier will it be for you edit the pictures. Moreover, it will also help you to get cohesive results.
Un-sharpen the camera:
Keep your camera in the dull mode to get a cleaner shot. A sharpened footage will compress the inputs, thereby producing a slightly jagged or bit mapped picture.
Light your background as well as foreground separately:
Make sure that your blue screen backgrounds and the subject are evenly lit. If you are taking a full shot, light the floor as well. Use two different lights to illuminate the subject as well as the background. The better the separation, the lesser will be your post-production headaches.
Position your subject significantly away from the background
I have seen many photographers struggling with the issue of color spill and spending hours for editing a simple photograph. Color spill/color cast is not a very big issue and can be simply handled by making your subject stand away from the backdrop. The minimum recommended distance is 6 to 10 feet.
Don't trust the light meters
They don't work effectively for a blue screen shoot and therefore, you must use a Vectorscope to identify the hot spots. For getting accurate results, you must physically analyze how your subject will be visible in your photographs.
If you follow the exact principles of Chroma key photography, making convincing photos will be as simple as a cakewalk for you.
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