why do I get a line around the thumb when masking. Some frames it is there, some frames it is not there. Got a deadline dontchaknow.
@sbrady Not sure why exactly it's got the line, but have you tried fiddling with the feather on the mask to blend it together and maybe remove the line? I think by default it feathers both sides of the mask but I think the strength is low or none existent by default. I can't recall. Just a thought.
You can get a line if you apply a Mask to one layer, duplicate it, then invert the Mask on the second copy. It's a way to allow you to insert something behind a masked object fairly easily by putting it between the two layers and having (in theory) no holes anywhere. But the Masking maths isn't 100% accurate, so you do have to feather one of the masks to get rid of that line. Can't remember which; so experimentation will reveal all...
when I feather, I get a dark line......what dark, the image is a white shirt.
What if you add some pixels of expansion to the mask?
@sbrady Did you ever get your issue with the dark line solved? If not, and you are still working on it, I had another thought of something to try. I ahve seen lights added to a scene affect the layers if the properties for shadowing are checked. Is it possible that is a shadow of the thumb layer above the main video layer and it's casting shadows?
I don't think so, I don't have a light on that layer. I fiddled around a lot, seems to be working now and I'm not sure what I did. I'm a newbie so chalk it up to I don't know what the hell I'm doing yet.
@sbrady. Well, the main thing is you got it sorted. And about finding the answer without knowing what you did I'm sure we've all done that one time or another. I know I certainly have!
@sbrady @Palacono @Emecorp I'm late to the game, but I suspect the initial issue is a simple antialiasing thing. I'm pretty sure masks in Hitfilm get automatically antialiased, which could actually cause a pixel of translucency when the two mask edges are supposed to fit like perfect puzzle pieces (Palacono, this would not be a bug or a maths error).
sbrady, I suspect your fix was probably 1 or two pixels of expansion, feathering or both.
@Triem23 it even happens with rectangular masks, so whether antialiasing is the reason or not on straight lines, it's still a (minor) pain in the rear. An expansion of between 0.5-0.7pixels fixes it.