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Posted by Tech Geek on 10/07/58 11:37
Hi! I've already sent this message out to rec.video.professional, but
nobody was able to help me . . . hopefully somebody here could!
Anything is much appreciated:
I am the lead technician at my school in Ontario, Canada. Every morning
we have "announcements" during which students announce school news and
the principal speaks for a couple of minutes. We have been doing it
the same way for years, using an old Panasonic WJ-MX20 as our video
mixer, and a cheap Radio Shack board as our sound mixer (the
announcements are broadcast live through all the TV's in the
classrooms).
Anyway, the other day I decided I would try to use the Chroma Key
effect built into the Video Mixer (WJ-MX20). I understood that a green
or blue screen works best, but at the time I only had a simple white
canvas. As far as I'm concerned the white wouldn't do a good job as
skin pigments are mainly white, along with clothes, etc. However, I
wanted to make sure the effect worked at least decently and in the
right way before I painted the canvas green.
I checked with the instruction manual (availible online) and followed
the directions very carefully. I put a student in front of the canvas,
put the camera on the student and canvas background, selected the
camera on the B-BUS (it's a two bus board (A and B)) as told by the
directions, and put the picture of a mountain scene on A-BUS (coming
from the computer). To activate green screen, you use a little curser
on the preview television hooked to mixer to select the background
which you will be "changing". I did as the instructions said, pushed
enter, and it did the opposite of what I wanted! It made most of the
student mountain-designed, and the white canvas . . . white. I tried
positioning the curser over the student hoping that it might work and
it did the same thing!
If anyone out there has any idea on what to do, I would appreciate it
GREATLY. Thank you very much!
Alexander Tingle
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