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Color calibration
Image 15-2: Correction of native color gamut towards desired color gamut (electronic correction)
Electronic correction
The electronic correction adapts the native color gamut towards the desired (target) color gamut (e.g. DC28_
DCI_Xenon.TCGD). This correction is introduced by the DMD drivers and is also called 'P7 correction'. The
electronic correction takes place once the MCGD file of the projector is mapped with the TCGD file of the film.
Influence of aspect ratio
The aspect ratio of the projected image could have a small influence upon the measured xy coordinates.
Therefore, it's recommended to save the xy coordinates per aspect ratio in separate MCGD files.
CAUTION: Prior to start with color gamut calibration ensure that the white point calibration is
finalized successfully. See "White point calibration", page 172.
Color gamut calibration procedure
1.
Check if the white point calibration is done. If not see "White point calibration", page 172.
2.
Setup the ambient light conditions as it should be during the play out of the movie. (e.g. only the stairs and
emergency exit lighting is switched on).
Note: In an optimal setup less than 1% of light from any other source than the light from the projector
should illuminate the screen.
3.
Sequentially measure and enter the xy coordinates of the three primary colors (red, green, blue) and full
white. Use therefore the Communicator. Go to Installation > Color calibration > Measure native colors. For
detailed instructions see user guide of the Communicator.
Caution:
Ensure that the correct projection mode is selected: 2D or External 3D.
Caution:
In case of 3D, measure the xy coordinates once through the left eye glass of the 3D goggles
and once through the right eye glass.
Tip: When using the wizard for white point calibration you can immediately proceed with the electronic
correction.
4.
Once all xy coordinates are measured and entered proceed by saving all measured values into a MCGD file.
Tip: Put in the MCGD file name the type of projection mode (2D or External 3D) and the aspect ratio
(FLAT, SCOPE).
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R5906897 /02
Prometheus III
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