Fairlight CVI, User Manual

Page: 48 / 283

V IDEO EXE RCIS ES
If you h ave read the previous section - PAINT EXERCISES -
then you're read y for VIDEO EXERCISES. We will work t h rough
some
exa mples, and see how PAINT and V I DEO overla p. The
a bilit y to select PR ESETS and MENUS is a ssumed.
A
camer a or other source of video i mage must be connec ted to
the
CVI
for the video effects. It is a lso desira ble to have a
chroma-key blue backgrou n d , to enha nce many live effects. In
fact, all references to live image in this section assume the use of
chroma-key. The CVI can be used to establish c h roma-key levels
by using PRESET
99.
See Section 3
-
SETUP Men u. If you intend
using chroma key, the following may be hel pful.
Chroma-Key Setup Suggestions
Have the artist's model in front of a medium blue flat, non­
reflective background (usually a wall o r screen).
Ensure
adequate lighting, such t h a t no shadows fall o n the
background. This would require at least two floodlights either
side of the subject. However, too much floodlighting can result in
'hot spots' o n the chroma key background. These areas cannot be
keyed out, so the floodlights would have to be re-arranged.
The subject should not wear any blue clothing as it will
'disappear' on screen. This can be used, however, to create
e
f
fects.
Use PRESET
99
and the HUE, S ATURATION and VALUE
sliders on the control console to 'key out' the blue background
.
See Section 3
-
SETUP Menu.
Several video effects require the video image to be movi ng, in
order to see the effect.
General Overview
The CVI can accept up to two video inputs, the cascaded
output and stencil output of a nother CVI, audio input for music
control of effects, and remote control trigger. Therefore, many
permutations of live CVI effects exist which are not covered in
this section. However, enough effects will be discussed here to
enable you to discover new t hings to do with the CVI which even
we haven't thought of yet.
STARTED
-
7