How do you make the impossible possible ? Speeding through the forest on ski’s,making a car go underwater, make a game of Quiddich seem real or even the TV weather forecaster standing in front of the animated weather systems.Well,all of it is illusion created by effects known as green screen or Chroma key software.This program allows you tremendous artistic control to put subjects in totally imaginary situations but for it to appear totally real.
One of the biggest problems we see in developing believable shots, no matter what the medium is with the lighting. With the new program suites and technologies that companies are producing, managing the technical aspects of removing the subjects and placing them into a new position has becomesimple to do. So we find ourselves at a place where creating a great shot is less about technical know how, and more about an eye for detail, composition and lighting.
The good thing is, if you’re doing your own special effects, there are some easy steps you can take to ensure it works with yourpictures. These are things we do every time we pick up the camera, and they’ve saved more than one session in the end.For a photographic project that requires shooting the person against a green, blue or chroma-key background, you should know that it takes more than good lighting to avoid having your project look amateurish.
Green/blue screen or chroma key software are each preferred for different types of shots.
1.Begin with the end: Before you even shoot a picture, think ahead about what the background of your project will look like, you should also be able to choose the appropriate camera height and lens that would make sure your footage edits well. The more planning and vision you have at the start, the more professional your work will be at the end.
2.Stay away from the background: Position your subject at least 8 feet away from the screen. This will reduce your spill and if you’re using a longer lens, it will also help separate the subject from the chroma key, which will give you a clear edge. Often the background color reflects onto the person creating a slight blue tinge around the edges. This is known as blue spill. It doesn’t look nearly as bad as green spill, which one would get from green.
3.Ensure the screen is lit evenly with no shade areas or shadows and that includes the floor for full length shots.
4. Have a script to work with,this will eliminate you forgettingwhen a shot or which prop is used when.Remember KISS.
5.Your subject should not be wearing anything the same color as the screen, green/blue depending on the background color,or parts of them will be invisible.
6.Ensure your green/blue screen is evenly lit. Any shadows can cause discoloration and patches, which is not good.
7.Ensure the camera is not on “Auto White Balance”. Set it to manual and hold a piece of paper up to the lens so it can analyze the white balance with the light in the room
Be creative! Remember, with Chroma key equipment you can stand on a blue/green thing, and make it look like you’re flying!
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