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Chromanator tutorial: Garbage mattes
Simple cloning with split screen
In this project I'll show an example of how to achieve 'cloning', whereby you can use the same actors/props to portray multiple subjects in the same shot. I'll use these three separate shots:
First I will set up Clip 2 by switching to the Object View to access the tools. Clicking on the Key tab and then the Garbage Matte tab accesses the correct toolset. It is important that the garbage matte includes the shadow that the marine is casting on the blue barrel just behind him, which will result in a matte that looks a little like this:
It is easier in this case to draw the mask freehand (instead of clicking each individual point).
That's one marine taken care of. The marine in Clip 3 is a little trickier, as his shadow on the right-hand barrel needs to be included, but an all-inclusive shape won't work, due to the other marine that stands between the actor and the barrel. I could draw an awkward shape that goes off the bottom of the frame, then loops round to include both the marine and the barrel, but there is a neater solution.
Switching to Clip 3, I add a new section with the button and draw around the right-hand barrel. After closing and locking the shape, I turn the Invert Matte option On. This excludes everything except the barrel.
Of course, I don't want it to exclude the marine as well, so I'll create another section and set it up to add the marine back into the shot.
A new section can be added with the button and I can then draw a simple shape around the marine.
The Transparent/Opaque Matte option can prove very useful when making complex composites.
If lighting differences highlight the shape of the matte, feathering can be used to blur the edges. These two simple garbage mattes will result in a perfect composite, which an audience would never even guess was a special effect:
Taking the next step