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what is RealColor?
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What is RealColor? p a g e 2
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What is RealColor?
Projector colour management by projectiondesign.
RealColor is projectiondesign’s implementation of a simple and accurate
colour management system for projectors. It allows the user to correctly and
easily calibrate and set up a projector to a desired white point and grey scale
tracking with a minimum amount of effort.
How does RealColor work?
RealColor works by giving the user access to necessary colour management
adjustments, and by having the projector accurately characterised at
the factory before it is shipped. Every single projector goes through a
characterisation routine before it is packaged and sent to the customer.
Calibrating using RealColor includes two main process steps:
• Characterising the projector – done at the factory
• Selecting and setting the desired colour management mode and
display characteristics – by the user or installer.
During the characterisation process, each individual projector’s optical and
electrical characteristics are measured and recorded, then input into the
projector and stored as system settings. By storing each unit’s individual
settings, every single projector knows it’s true optical red, green and blue,
as well as the optical white point possible. These settings are stored using
highly accurate X and Y colour coordinates. Also calibrating, recording and
understanding the electrical properties of each projector provides an easy
way to set up and properly calibrate each projector individually, without
having to understand projectors and colour management in general.
An extremely effective image processor calculates correct grey scale tracking
from white through black, by interpolating the desired settings from the white
point all the way down to black. Grey scale will, as such, carry the same
colour through all shades of grey, and linearly follow the desired setting.
What is RealColor? p a g e 3
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What does RealColor provide?
RealColor provides two main routes to setting up the display to a desired
setting, in addition to running it uncorrected:
• Colour temperature tracking control
• X, Y colour coordinate manipulation
Selecting the “temperature” setting from the mode menu gives access to
a colour temperature setting scale. It can be set to any colour temperature
between 3200K (very warm colours) and 9300K (very cold colours), in 100K
steps. When selecting the different temperature settings, colour temperature
will vary according to the setting, and slide accurately along the black body
curve. Normally, one would like to select 6500K (default setting) for an
accurate display of video white.
Selecting “coordinate (x,y)” from the mode menu provides access to setting x
and y colour coordinates individually. This normally requires some knowledge
about colour coordinates, and how colours are measured, but provides the
most accurate and influential settings. Setting the x and y coordinates in
a system allows direct access to altering the colours along both axes, and
provides an accurate setting of the desired white point. x and y coordinates
can be set to eclipse any colour in the available optical gamut for any one
projector, with a three decimal accuracy. The default setting is D65;
X=0.3127, and Y=0.329. There is also provision to reset the x and y
coordinates to D65 with a singe operation.
Setting RealColor to “not corrected” in the mode menu gives the optical
white point of the projector. This normally deviates from the desired white
point for video, as there are colour deviations in most optical and electrical
components used, such as lamp spectrums, colour wheel filtering and
coating, projection lenses and illumination optics, A/D converters and video
processors. Setting an uncorrected mode normally yields the highest possible
brightness from any one source, but may be unusable with video. This is why
RealColor™ comes in very useful for most users, and very easy as well.
RealColor characterisation is carried out using specially calibrated
measurement instruments. For this process, we normally use PhotoResearch
Spectrascan 650’s. It is accurate within +/-30 degrees Kelvin throughout the
grey scale.
What is RealColor? p a g e 4
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Accuracy
RealColor colour management is extremely accurate with DVI/HDMI and
analogue RGBHV inputs. These are normally properly calibrated from the
source, and have little deviation, so there RealColor™ will give an extremely
correct white point and grey scale tracking out of the box.
Using Philips UHP™ projection lamps is very important. UHP™ lamps are
recognized for changing very little, and for keeping their colour spectrum
stable throughout their entire life, thus providing a minimal amount of
recalibration over time.
RealColor with uncorrected and deviating sources
For sources that deviate a lot from colour to colour, for instance analogue
video connections, the menu system and colour management system gives
access to a regular “source correction” option, with regular provisions for R,
G and B gain and offset. Using all these options wisely, it will be possible,
even for an unskilled user, to enjoy accurately rendered video with little effort.
© 2005 projectiondesign as
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red gain
green gain
blue gain
red offset
red gain
green offset
blue gain
green gain
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