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Magenta fringing using Primatte Keyer with Blue Screen Background
I am using After Effects CS4 and Primatte Keyer Pro to key bluescreen 2k ProRes footage from RED RAW 4k.
The bluescreen was lit exceptionally well and there is no spill on to the subject but every time I try and pull the key I am left with a magenta colored fringe around the dark, soft areas of the foreground subjects. I’ve tried using all the refine tools to fix the problem to no avail.
I feel that it has something to do with the Edge Color Replace being set to compliment but no other setting produces a better result.
What could I be doing wrong? Please advise. -
3 Replies
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It is the same result on both. Notice the magenta fringing in the hand and sleeve.
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You’ve double-checked that the magenta colour isn’t in the original footage, correct?
You can tweak with the spill suppression settings of your keying effect, perhaps (as Dave suggested) turn it off completely.
Thinking a little outside the box, you can apply the hue/saturation effect and set it to only effect magenta colours and then you can tweak the hue and saturation of that magenta into something much less noticeable.
– The Great Szalam
(The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.
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Are you using the same settings to try and key the entire clip? If so, you might consider creating different mattes for the most problematic areas of your comp. In my own work, I find that I have to make holdout and edge mattes for about 40% of the footge that I have to key. In some cases, you may even need to roto footage in addition to creating two or three mattes for a single shot.
BTW, do you have a shot of just the matte? Sometimes it’s easier to spot issues by looking at a grayscale image instead of a composited clip.
Shawn
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