By default, when a channel is opened, the isolation is set to a 60
degrees vector width, centred about the R, G, B, Y, C, M key
that was chosen. The lower saturation threshold is set slightly above
zero to exclude black and white areas from the isolation. The full
luminance range is included in the isolation. By default, the
thresholds of hue, saturation and luminance isolation are softened
slightly. The softness of all these thresholds can be independently
adjusted. However there is only one physical control for softness.
Whenever one of the above threshold controls is adjusted, the softness
of this threshold is automatically assigned to the seventh control on
the MegaDef panel.
To make a channel work on all colours, simply press the EXPAND
key. This is the key below GRAB on the MegaDef
control panel.
By default, the isolation occurs over the full picture area. However, the isolation can be limited to particular areas of the picture by using the region controls available for each channel. A double press of the button next to the ball on the MegaDef panel, will set the area to a small rectangle. Use of MASK or SHOW mode will ease adjustment of this region.
The region position can be adjusted using the track ball on the MegaDef control panel. The small button next to this track ball toggles control of the region between size and position. Press and hold this button to reset the region to be full screen. Then all parts of the picture will be in the isolation. Double press this button to set a default region. (A tall rectangle)