2. Hog OS Fundamentals 29
Many moving light consoles use HTP for intensity and LTP for all other parameters. By
default, Hog 4 OS uses LTP for all parameters, but you can assign individual cuelists to use
HTP for intensities (all other parameters are still LTP); see Highest Takes Precedence
(HTP).
2.6 Colour Matching
Fixtures of different types use different methods to perform colour mixing. Sending the same
parameter values to fixtures of different types might produce a different colour on each type.
For example, sending C=50%, M=50%, Y=0% will always produce a shade of blue, but it'll be
a different blue with different fixture types.
Usually, you have to compensate for this yourself by manually creating colour palettes by
eye to produce similar colours on all fixture types. This is a time consuming process, and
later restricts you to using the palettes you have already set up.
The Hog 4 OS's colour matching system provides a new way to choose colours, without
these problems.
2.6.1 Colour Models
Traditionally, colour mixing fixtures use the CMY (Cyan, Magenta, Yellow) system to
uniquely define each colour they can produce. With the increasing popularity of LED fixtures,
the RGB (Red, Green, Blue) system is also becoming more common. These two systems are
called ‘colour models’. Any colour can be represented equally well by either of these two
colour models - they are just different ways of conveying the same information. Many other
colour models exist, perhaps the most useful of which (for lighting control, anyway) is the
HSI (Hue, Saturation, Intensity) system:
Hue: This is the term used to specify the colours position in the possible range a colours,
from red, going through yellow, green, cyan, blue and magenta, and finally returning to red. As
the range ‘wraps around’, you can visualize it as a circle with the colours positioned around
the edge, with red at the top, green at the lower right, blue at the lower left, and the
intermediate colours in between. The angle between 0 and 360 degrees specifies the hue of
the colour: red has a hue of 0 degrees, yellow has a hue of 60 degrees, and cyan has a hue of
180 degrees.
Saturation: This is how ‘strong’ or ‘pale’ the colour is. Pale colours have low saturation,
while strong colours have high saturation. Saturation is specified as a percentage between
0% (white) and 100% (the strongest possible saturation).
Intensity: This is simply a measure of how much light is being emitted, from 0% (black) to
100% (the brightest possible). This is identical to the dimmer control on most fixtures.
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