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Hi. I shot a series of interviews against a white background. They look great. Now want to key video or photo using the luma key. It keys ok but when there is quick movement (say of a hand moving) the white is bleeding through. I have struggled with the values to no avail. I have also tried using the choma keyer, which gives me more control but same problem. any fixes or ideas? here is a shot of what i am talking about.
yes. i can upload tomorrow and post a link. thanks.
here is the link. let me know what you come up with. thanks!
Not trying to restate the obvious, but the shutter speed used caused frames captured with blurred motion, and that resulting smear is leaving areas of gray surrounding the quickly moving objects:
this makes it difficult/impossible to use the keyers to get a good looking key, as these areas are a graduation of luminance, and color.
My suggestion would be to have an electronic graphics person rotoscope a matte that trims the key to the shape of the hand, most likely using After Effects. This will probably need to be done frame by frame. They will also need to manipulate the color and luminance of the fill video so that the partial transparency that reveals the white bg is darkened and colored to skin tones to help hide the repair.
Ambitious, time consuming, and expensive. You should probably have a short clip (30-40 frames) rotoscoped to see if you are happy enough with the result to commit to the process.
MtD
Or try to create a bg that helps mask the problem:
hey mtd-thanks for taking the time to check it out. rotoscoping not an option due to expense and i can get around it for this project by coming up with other options and bag the luma key. next time, will go green screen.
i did like your idea about using a background that had a gradient as a temporary solution. thanks again.
ps: i would like to give you points but don't see any option to do so in the reply box.
Using Luma key (white background)
