hi allz, i want to make chroma key green colour with help of basic colour, what would i do, any body help plz

White hair will definitely make your job more difficult. As you have already said it will pick up whatever color is being cast on it. I would try putting a stand in in front of the wall, (we all know the anchors are way to busy to help us make them look good) with white hair. and experiement with different gels on the backlight. At the last station I worked at we used ultimatte on various screens on our set. We had to spend several hundred dollars experimenting with paint specifically formulated for ultimatte before the brass were satisfied. It took about three weeks of painting and backlighting before we got it right. We also had to limit the colors anchors were allowed to wear on the set in order to minimize color shifts in their clothing. Once again I would suggest looking at the LEE or Colortran swatch books and contacting them for advice. Scott

They seem to have a pink gel on his backlight, but it colours his hair (which is white) so we often take it out.

It has been a long time since I have done this, so I may not remember it exactly. Good looking chroma keys begin with proper lighting. Obviously, nice even lighting on the front of the subject is necessary, with plenty of separation between the screen and the subject. If possible light the screen and the subject seperately. But you also need to pay specific attention to the back light. Light hitting the chroma key screen from the front will be reflected back onto the back of your subject, thus the green or blue aurora seen around the subject in a poor key. To eliminate the colored aurora on the subject, you need to cancel the color out. On a blue screen, an amber or straw colored gel on the backlight will cancel out the blue reflection on the anchors clothing. If you are not trying to get rid of color reflections with your electronics, you can pay more attention to the proper painting of the camera and the key. Unfortunately I have never performed a chroma key on a green screen. I don't know what color gel will cancel out the green reflection. A LEE or COLORTRAN gel swatchbook would be a good place to start. A color wheel balanced for light (not pigment) would also show you where to begin. Whatever color lies opposite of green would be the place to start. Scott Dailey

Thank you!

Make sure your settings on CANCEL KEY are not too "wide". Cancel key says (for lack of a better term) how far into the picture to correct for color spill. The Color Cancel, which is where the cancellation color is generated, is probably set to your blue color. That, in concert with Cancel Key being "open" too much is probably why you're seeing a blueish tinge. All things being equal, I'd reset the keyer (on the key control block, hold down M/E region and Keyer button for 1 second) and start from scratch. Some times you'll spend less time going from scratch that trying to find out what's wrong. Also, FYI.... 8000 and 9000 have exactly the same chromakeyer electronics. RE

The 9000 has a CCD button in the key settings to adjust the source video, but all I really have is basic controls (video, y gain, chroma and hue) unlike the new Ultimatte Which is not in my studio) Anchor is between 4 - 5 feet from the screen. The colour shift seems to occur in the key process itself.

OK, never used a 9000 but I use an 8000 regularly and we use chroma keys for interviews often. What control were you adjusting? I once grabbed the "Chroma Adjust" controls and made an African American player look really bad, lucky for me tape also did an iso record and we fixed the interview after. Recently we did have a blonde haired ute look bad, his hair seemed to reflect light, but when a dark haired stage manager sat in, player had dark hair, the key looked better. Did your lights have any diffusion? How far away from the screen was the talent? I will say that I like the CK in the 8000 better then the one in the Kalypso and I would rather use a Kalypso otherwise.

We have a video op, the image looks fine on the camera clean, but once we key our anchor looks like Barney. Tried shifting the Hue in ccr but no joy, his face went green very fast. Is there any other trick I can try?

Do you shade your own cameras or is there a video op? Perhaps making a black balance or flare adjustment on the CCU would help.