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iPAX
The ARRI PAX LED Kit with True Match LED
Technology is a very flexible lighting kit, providing
natural light characteristics and an
almost endless color palette that can be set
with maximum freedom by adjusting color
temperature, green correction, dimming
and hue/saturation levels.
So far, this extensive range of features could
only be controlled manually with the Wireless
LEDs in Integration Spheres
The increasing digitization of film and video
camera systems will cause more and more
different models to flood the market. To check
the quality of these systems, typical image
parameters such as dynamic range, noise
behavior, or even color reproduction are
compared with standardized testing procedures
in order to make a statement about
differences. Full format charts are crucial in
order to test cameras as a whole system
and their image quality. In addition to the
small tolerances in the manufacturing process
of the test images, it is also the quality
of light which illuminates the test panels
that will be of fundamental importance. Integrating
spheres guarantee a sufficient uniformity
of the illumination and offer the
possibility to adjust brightness without a
shift in color.
A major disadvantage of current systems is
the limited lifetime of the bulb and the
inability to represent more than one color
temperature without the use of filters. With
the modification of an integrating sphere
implementing the ARRI LEO LEDs it is possible
to generate calibrated color configurations
and a variety of lighting situations. This greatly
expands the possible set of testing situations:
Light Controller. Time to add a software
and hardware package for full control of all
this features – the “iPAX” concept was born.
With this experimental software the user can
now control all features from a computer, either
manually or by macros – it can even translate
any kind of external voltage signals to display
them on the ARRI PAX LED. Analog signals
can be analyzed and converted into RGB,
HSI or Filter values. In addition to that, the
output can be triggered with external sources,
too. A typical application will be to get sig-
Camera systems can be tested throughout
a full range. For example, differences in
camera reactions to daylight and artificial
light are now metrologically recordable.
Effects that occur when illuminating with
saturated red, green or blue light can also
be made visible.
Through thorough calculation and simulation
of new lighting positions all interfering objects
inside the integrating sphere could be
removed. With all those modifications it
was possible to achieve much greater homogeneity
across the entire width and height
of the lighting aperture compared to old
systems.
Philip Schneider
The zemax
wireframe
graph
nals out of a computer to create real lighting
effects that accurately represent those in a
virtual video, image or 3D environment.
Michaela Giglmeier, Lorenz Gerold
L i g h t i n g
The Wireless Light
Controller
Conventional integrating sphere
The test set-up with LED lights
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