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Green green subject shrinking/growing post edit
I am using green screen tech for first time. subject matter is classical musician in a recital like setting. it’s a simple tripod setup; editing (zooms, pans) done later in final cut. It occurred to me that these edits would make subject seem to shrink or enlarge, with a virtual background. Do I need to proportionately edit green screen footage? And how to do it realistically.
Thank’s Ray
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3 Replies
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Start with your footage and the background image that is going to be keyed at 100%.
When you change the scale and/or position of the footage, you need to also change the sale and/or position of your background image.
By doing this, you will not see any shrinking or enlarging.
David
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Select both tracks and make it a compound clip. Then any scaling or re-positioning you do acts globally. To take the shot to the next level, though, you will want to simulate the focus changes when depth-of-field is short. In wide shots, the background is relatively sharp. In the re-cropped tighter shots, that backdrop should get some extra blurriness; use the gaussian blur filter on it as you also scale it up independently. This should be a subtle difference, but it markedly improves the illusion of a real world camera move.
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thank you for this second level technique. should there be any concern by using 2 cameras on initial video at different angles or one camera closer than another ? esp when dissolving between cameras? thanks Ray
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