Chroma Keying at Night
Chroma keying for a night scene can make the entire process very easy. Night scenes can be difficult to shoot because night scenes require a lot of light. Originally, the chroma keying was done during night scenes because it is much easier to combine the 2 images. Much of the digital effects were originally done at night, as it was easier and looked more realistic. The biggest key to doing chroma keying at night is getting the lighting right.
Step 1: Replacement Image
It is best to have the replacement image before doing the shooting because it will be easier to light the scene to match the background image. These nighttime scenes can be shot on a green screen set at any time, as long as the lighting is proper. Make sure that the green screen is well lit, but that the object or actor is lit as they would be for the nighttime scene.
Step 2: High Quality Capture
To ensure that the final product is high quality, it is best to capture the film at the highest setting as possible. Also, make sure the background is one green color if possible. Chroma key paint is the best. The actor also should not be wearing anything that is close to this green color. These tips make the entire effect process in post production much easier.
Step 3: Obtaining the Image
Normally, chroma keying is used when the film budget does not allow the entire crew to go to the actual destination around the world. Also, the environment may not exist, or it may be too dangerous for humans to be near. A single camera crew may go and film the image, or it is possible to purchase images. Some images are also available for free if they are common images.
Step 4: Keying Out
Video editing software will be necessary to key out the green screen background. The software will take the single green key color and completely remove it. If the background is only one green shade, then this is very easy. However, if there are multiple green shades in the background, this gets more difficult as multiple keys will need to be removed.
Step 5: Insert
The new image background will be inserted into the shot through an additional layer. It may be necessary to add shadows and clean up the edge of the actor into the new background so the 2 layers will seamlessly fit together. This fine tuning can make all the difference between an okay green screen effect and one that is great.
Step 6: Props
Green screen can be used for only a part of the shot, as many times props will be used. For an actor that may hold fire in his hands, the actor may be holding a ball, and then in post production, the ball in his hand will be replaced with a fire ball. There are many things that can be done with chroma keying effects.
Step 7: Software
Good software is a essential to achieving this effect. Software that offers plenty of options for cleaning up the green screen replacement is best. Some software does have limitations.