using chroma keying, why some other parts of body or objects became transparent?

psjohny wrote on 5/3/2003, 2:04 PM

Using blue screen and chroma keying feature ,my hair (black color) got transparent some other part of my shirt body too! they aren't blue color why did it happen?

Comments

SonyDennis wrote on 5/3/2003, 4:50 PM

Try this: solo that track, click the "show mask only button" and then adjust the threshold sliders until the background is pure black and the foreground is pure white. Un-check, un-solo, and check the result.
///d@

BillyBoy wrote on 5/3/2003, 6:13 PM

Also sometimes just a tad adjusment of the contrast/brightness filter helps too.

psjohny wrote on 5/4/2003, 4:48 PM

The result is getting better, but why some other color that's not blue also effected by this chroma key feature?

BillyBoy wrote on 5/4/2003, 5:03 PM

Did you actually shoot in front of a 'blue screen' or are you just using the filter to see what happens? Lighting can make a big difference if you used a real blue screen.

Did you try clicking on several areas of the color you are trying to mask (with eye dropper) to see if you can get a better result?

Without seeing it, its hard to say. It can be a trail and error thing.

TheHappyFriar wrote on 5/4/2003, 7:11 PM

There is blue in all the other colors, you just don't "See" it. Since all the colors on the computer are comprised to Red, Blue, Green, unless it's a pure one of those, it has a little of the other in it. Blue/green screening is tricky. The blue,green screen needs to be a flat, bright shade. Use a seperate light source for lighting you. Also, the clothing you wear shouldn't have any traces of those colors in them (ie blue jeans have a little green in them).