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Keylight Question
Ive had some issues when doing a key with keylight….the footage was shot on Digibeta and the key was set up pretty good as far as lighting goes…what happens is i notice when the subject moves there arm or somthing…the edges of the key looks all funky like the footage was interpreted wrong even though i am sure the interpretation is correct…any ideas what might be causing this?
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5 Replies
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without being able to see the funky edges it’s a little hard to say…
you’re sure you are separating the fields correctly? to test, create a comp that is double the frame rate of the footage, drop the footage in. ram preview, or advance thru the footage frame by frame. does the movement in the footage seem correct? if its wrong, it seem to move forward then backward every other frame.
if fields are separated correctly, let us know how you captured from digibeta (what codec, hardware, etc.) and if you converted that to get it into ae.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW -
Im very sure i interpreted the footage correct (lower field)I captured the digibeta footage using Avid…and i create a quicktime reference file then import into AE. Im guessing its a setting in Keylight…
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what did you capture to in the avid, meridian 1:1, avid dv…?
describe the funky edge a bit… when you mention edge issues on moving parts of a subject while keying, i immediately think of a jagginess or waviness due to interlacing and trying to choke the key a little.
since it seems to be limited to moving areas, do you think the edge key issue is due to motion blur? did you do any prep before the key, like junk matte the subject to better define the a keying area (limit the amount of information to key out)?
if you haven’t already seen it aharon robinowitz did a tutorial on creating supertight junk mattes. that process can be spead up a bit using a duplicate of the inital keyed footage as a track matte and applying minimax to the alpha to expand it rather than auto trace.
anyway, tightening up the junk matte can help in maintaining detail in softer areas, like motion blurred edges, if you think that may be causing problems.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW -
the footage is 1:1 on an Avid Composer w/ Mojo SDI. Ill try the super tight junk matte and see if that works…
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You mentioned earlier you separared fields lower field first…isn’t digibeta upper field first?
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