Maat wrote:brianv wrote:If you googol "Chroma Key Artifacts", this is one of the first posts.
"I'm always getting a doggone black outline around my subject when keying out a background using a green screen and using a magenta hairlight. I'm using an ancient DSR250 with 4:1:1 compression (not great). Anyway, messing around with all the controls in keylight I can't get any satisfaction in getting rid of the black outline. Shrinking the matte makes the talent look really unnatural. I tried using Adobe Ultra, which does a great job of keying. The lighting is even, the whole thing keys out fine except for that crummy black outline. Any suggestions?
Thank you, BrianV!
"stubborn black outline artifact on chromakey
by Lisa Inserra on Feb 21, 2010 at 3:05:03 pm"
Still having that problem in 2010, eh?
Indeed Maat and brianv, but did either of you read the bottom of the page? It completely contradicts itself in the following post:
Re: stubborn black outline artifact on chromakey
by Dale Paquette on Jan 3, 2011 at 6:40:46 pm
I may be a day late and a dollar short on this one - but - I also experienced this problem and have made the observation that the brightness of the BG seems to affect the situation. Namely, a darkish BG clearly shows the black outline whereas a bright one doesn't. Just to check this, I moved the FG around to examine it over different parts of the BG and sure enough, the outline disappears whenever the BG is bright enough.
To be sure, any of the imagery in question that shows the dark fringing on the perimeters of the buildings all have a lighter background, in this case the sky.
Your example shoots itself in the foot when you read its entirety in context.