Posted 05 December 2005 - 05:06 AM
i looking for some advices for shooting with a F900 in a studio with a green back ground...
Posted 05 December 2005 - 11:12 AM
In terms of the camera, it's actually better to turn some functions off -- turn off edge enhancement (Detail), turn off Color Matrix, turn off ITU-709, etc. In other words, don't overly process the signal to try and improve the chroma of the screen, etc. because then you create edge artifacts that can make keying harder. Just light and shoot the screen well (correctly).
Talk to whoever is doing your composites as well and see what they want.
Posted 18 February 2006 - 04:38 AM
what do you think about the shutter speed? can it make keying easier with a 1/200 speed for example?
Posted 18 February 2006 - 07:29 AM
Short shutter periods can make it easier to achieve a "good" key. However, it really depends what you mean by good, as what you'll then have is an effects shot with a 1/200 shutter cut into a sequence with 1/48 shutter, immediately flagging it up as subtly different. For this reason I'm not a fan of the technique.
Posted 18 February 2006 - 11:32 AM
The bigger issue is the fact that the F900 records 8-bit 3:1:1 with a lot of compression, so there is sometimes some problem with slight chatter on the edges of keys. But there is not much you can do about that unless you budget for a better camera with a separate recorder.
Posted 18 February 2006 - 12:09 PM
It is also imprtant to have the screen underexposed from your shooting stop...with green I go 1 1/3 under, blue I go 1 1/2 under. Make sure the screen is lit as evenly as possible.
If there is a little color spill on your talent I wouldn't worry. The green spill will just be replaced with the color of whatever you replace the screen with and look quite natural.