Filmmakers use a variety of techniques to deal with glasses in front of green screens. One of the most common methods is to have the actor remove their glasses and replace them with a pair of clear plastic lenses. This allows the actor to maintain the appearance of wearing glasses without the reflective properties that can cause issues during the compositing process.
Another method involves using special anti-reflective coatings on the lenses of the glasses. These coatings help to reduce the amount of light that reflects off the surface of the lenses, making it easier to key out the green screen behind the actor.
In some cases, filmmakers may also choose to use a technique called rotoscoping. This involves manually masking out the glasses in each frame of the footage and replacing them with a computer-generated image that matches the actor's face. While this method is time-consuming and labor-intensive, it can be the most effective way to deal with glasses that are causing problems during the compositing process.
When dealing with glasses in front of green screens, it's important to ensure that the lighting on set is carefully controlled. This means using diffused lighting to minimize glare and reflections, and positioning the actor in such a way that the green screen is not directly reflecting off the surface of the glasses.
It's also important to consider the color and type of glasses being worn. Some glasses, particularly those with heavily tinted lenses or non-reflective coatings, may be easier to work with than others. In some cases, filmmakers may choose to work with the actor to select glasses that are less likely to cause issues during the compositing process.
In summary, filmmakers have a range of techniques at their disposal when dealing with glasses in front of green screens. These include using clear plastic lenses, anti-reflective coatings, rotoscoping, and careful lighting and positioning on set. By carefully considering the type of glasses being worn and the techniques that are best suited to the specific situation, filmmakers can ensure that they are able to achieve a seamless and realistic final product.
- "Green Screen: What it is and How to Use it" by Hannah Warne, Shutterstock blog, 2020.