Blue/Green screen setup...

[gazaly]

http://media.wiley.com/assets/170/34/0-7645-4114-5_403.jpg

[GNS]

Gr8...
Thanx

[GNS]

is it possible to Remove Blue Screen in Premier...?

[chaminga_d]

Hmmm... What I'll Choose... Green or Blue?

On film, the green layer has the finest grain structure. On NTSC video, the green channel has the highest sampling rate.

The blue layer of film is sharpest but is also the grainiest layer. In video, it is the noisiest channel. If you are shooting DV Video (4:1:1), it is probably best to stick with green screen.

Then What will be the Screen? Mother's old Saree... hihihi

Finally What will be to Lightning...? Fluorescent or Incandescent lighting....

[gazaly]

is it possible to Remove Blue Screen in Premier...?
yeah!!

[gazaly]

Hmmm... What I'll Choose... Green or Blue?

On film, the green layer has the finest grain structure. On NTSC video, the green channel has the highest sampling rate.

The blue layer of film is sharpest but is also the grainiest layer. In video, it is the noisiest channel. If you are shooting DV Video (4:1:1), it is probably best to stick with green screen.

Then What will be the Screen? Mother's old Saree... hihihi

Finally What will be to Lightning...? Fluorescent or Incandescent lighting....

Pros and Cons of blue screen vs. green screen
1. If you are shooting on film and plan on doing the composite through traditional
optical methods. you must shoot blue screen.
2. A Green Screen generally takes less light to light it.
3. The blue layer of film is sharpest but is also the grainiest layer. In video, it is
the noisiest channel.

[gazaly]

Concept of Blue / Green Screen
Blue Screen was originally invented as a film technique to separate the actors and
composite them over another background. Blue was originally chosen because it is
the one color which does not exist in skin tone. Skin tone is made of a combination
of red and green.

[gazaly]

Procedures:
1. Screen should be no closer than 12-15 feet from the foreground.
2. Director of Photography should NOT use: Low Contrast, Fog, Diffusion, Super Frost
Filters or smoke when shooting blue/green screen.
3. Light up the blue/green screen and leave the foreground image in darkness.
This will give you the opportunity of visually inspecting where all the blue/green
spill occurs. Much of it will disappear when the foreground lights are on.
4. Check all angled and glossy surfaces for unintentional reflectance of the
blue/green screen. Spill can sometimes be canceled by applying lighting to the
offending area or cleaned up with dulling spray.
5. When the screen is lit, view the screen with a spot meter and check for
uniformity. The screen should be within 1/5 stop tolerances in all visible areas. I
like to add a 1/2 or full stop minus green (3308) as well to help. When the screen
is evenly lit, it pulls a better matte.

[system_v]

TNKZ BAN.....!!!!

[lasanka]

um ok.. tnx!

[GNS]

yeah!!

How?

[GNS]

http://www.fileden.com/files/2007/3/14/886237/bl.JPG

What is da Purpose of this OH Fluorescent?

[gazaly]

How?
Green screen Techniques in AE

1. Lighting is crucial. At the very least you will need a light to light the greenscreen, and one to light the subject. I did this tutorial with 3 lights -- a Key light (main light on me), a backlight (sometimes called a "rim light"), and a diffuse light to attempt an even light on the greenscreen to avoid harsh shadows. It also helps not to have any creases or lines in your greenscreen. You can find many tutorials online for setting up 3-point lighting.

2. If you do have a wrinkled or otherwise marked up greenscreen, it can help to shorten the depth of field. An example of a shortened depth of field would be to hold your finger in front of your face and focus on it. Notice how everything in the background becomes blurry. To achieve this with your Digital Video camera, either zoom out and get really close to your subject (helps to have a wide angle lens), or get far from your subject and zoom in. Set your camera to manual focus. This will help defocus your greenscreen.

3. Separate your subject from the greenscreen. If at all possible, you should have about 10 feet between your subject and your greenscreen. This will cut out shadows on the screen, and also minimize "bleed" on your subject. Don't worry squeamish people, this only means the green color shows up on the subject.

Alright, enough of the technical jibber-jabber. Let's get on with it! Oh, and bonus tip #4, don't wear small stripes as I did...

http://www.layersmagazine.com/images/tutorials/video/9/step01.jpg

STEP 1:

Import your captured video into After Effects, and place it on the timeline.

http://www.layersmagazine.com/images/tutorials/video/9/step02.jpg

STEP 2:

If your subject is fairly static, or if you have other things in the shot such as light poles or wires, you can create a garbage matte around the subject using the Pen Tool. This can be a very loose outline. Be sure to leave enough space to choose the key color. For the rest of this tutorial, however, I will not use the garbage matte.

http://www.layersmagazine.com/images/tutorials/video/9/step03.jpg

STEP 3:

Select Effects>Keying>Color Range. This will allow us to get the sneaky uneven green pixels. (Try using Color Key if you like, but it is much harder to get good looking results.) Set the Fuzziness to 20 (you can always adjust this). Set the Color Space to Lab. Next to the preview window you will see three eyedroppers. Choose the top one (no "+" or "-" symbol). This will allow you to get a baseline color to key out.

http://www.layersmagazine.com/images/tutorials/video/9/step04.jpg

STEP 4:

Find a relatively even green area. You can see that in my example, the right side of my green screen is a bit more even then the left side. Click with the eyedropper to select the green.

http://www.layersmagazine.com/images/tutorials/video/9/step05.jpg

STEP 5:

Well that didn't do much on mine, so now I need to increase the range of green included in my matte. Now select the eyedropper with the "+" symbol and choose another fairly even portion of green. Now we're getting somewhere. Repeat step 4 until you can get the background gone. Don't worry about the small bit of green around the subject, we will take care of that next.

http://www.layersmagazine.com/images/tutorials/video/9/step06.jpg

STEP 6:

Now to get rid of the green halo. Select Effect>Adjust>Hue/Saturation. Select Greens from the Channel Control. This will focus our adjustments just on the greens in the image. Notice in the channel range there are some triangle shapes above the green part. Move the Green Saturation slider all the way to -100. Adjust the Green Lightness slider to blend the grey with the subject.

If you still see hints of green on the outline of your subject, you can adjust the rectangles in the Color Range by sliding them towards the triangles. This will widen the range of greens being affected.

http://www.layersmagazine.com/images/tutorials/video/9/step07.jpg

STEP 7:

Import a background movie or image to test your new-found keying prowess! Depending on your background, you may have to adjust the Lightness slider to blend with your background.....Happy Keying Machan.....

[zCexVe]

maxa wedak..Hebei green screen unath premiere vala dee poddak hitinava.Agen kellak yanava mai..lightin valin hadnna apita bene..A unata eka TV capture card ekak ekka ena software ekak thiyenava ovata maxa.Mata den eka mathaka ne.

[gazaly]

http://www.fileden.com/files/2007/3/14/886237/bl.JPG

What is da Purpose of this OH Fluorescent?
Fluorescent eken thamai foreground ekata Day light 1i Sky light 1i hadaganne...