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what is RealColor?

ability

insight

knowledge

understanding

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.

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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.

mode

red gain

green gain

blue gain

red offset

red gain

green offset

blue gain

green gain

blue offset

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