chromakey bleedthrough

pugsly1011 wrote on 2/10/2003, 11:36 AM

I have a project with chroma key and you can see bleed through on the subject. It was shot on a true greenscreen with plenty of light, no shadows. I have played with the thresholds but you can still see the background bleeding through the person - am I missing something??

Comments

DataMeister wrote on 2/10/2003, 11:42 AM

What are your settings? And what version of Vegas?

Also before you reply, check to make sure your track opacity is set to full and any track composite level envelopes are set to full. I had that happen accidentally to me once after dropping a clip onto an exsisting track with another clip that needed a little transparency. I felt like an idiot when I finally figure out what was happening.

JBJones

pugsly1011 wrote on 2/10/2003, 12:46 PM

both are at full. I am running vv3. I've played with the threshold settings as well but it still bleeds through

Chienworks wrote on 2/10/2003, 1:39 PM

pugsly, can you post the .veg file and a screenshot that illustrates the problem? That would probably help us figure out what's going wrong. If you don't have a place to post them, you may eMail them to chien@chienworks.com and i'll put them on my server for folks to look at.

MrEd wrote on 2/10/2003, 4:39 PM

Were you recording with a DV or a Beta cam? I heard that the green screen effect is very hard to do well with a dv cam.

rossf wrote on 2/10/2003, 5:18 PM

that last comment is true,for starters i got better results using a green screen that was lighter than customary,otherwise the camera read the green as quite dark,resulting in pixels of the same color as perhaps the subjects dark clothing so that it was hard to key only the background.my best green screen was that sort of parachute material in quite a light almost fluro yellow green,it always showed up on screen as much darker.

DataMeister wrote on 2/10/2003, 7:24 PM

What exactly are the settings that you are using in the Chromakey plug-in?

R =
B =
G =

or

H =
S =
L =

Low threshold =
High threshold =

Blur amount =

[] Show mask only (checked or unchecked?)

JBJones

Chanimal wrote on 2/10/2003, 9:30 PM

I chromakey off green all the time. It doesn't matter which shade--I use light green at the office and dark green at home (a green sheet taped tightly to the side of a 62" TV and then post 2,000 watts of halogin shop lights about 20 feet, 45 degrees to each side). I don't use any of the pre-config "green" or "blue" screen settings. Instead I select the color pick and pick a color from the screen. I often have to try a few different spots around the screen to find the best area (my shots are not that even--yet I still get crystal sharp edges).

If you have a server I can post some jpgs showing before and after. I hope this helps.