Lumagen VisionProHDP - Manual (Page 14)

VisionPro HDP
™ User Manual and Installer Guide
© 2004-2006 Lumagen®, Inc. 11 Rev 1.1
source (either size or levels) does not affect the calibration. Later, differences between
inputs can be calibrated using the source devices. If grayscale is to be calibrated, a base
line calibration should also be done after setting black and white levels.
•
To calibrate the black and white levels, select the Lumagen contrast test pattern
( MENU → MISC → TPAT → OK ), then use the left-arrow key to select the contrast test
pattern. This pattern has two white rectangles and two black rectangles. In the dark
areas, there are two vertical bars – One at 4 IRE and one at –4 IRE. The white area has
two vertical bars – one at 96 IRE and one at 104 IRE. Note that 0 IRE is reference
black and 100 IRE is reference white. Since –4 and 104 are outside the nominal black
to white range, not all displays will show these levels.
First adjust the display’s black level using the brightness control. Adjust so that the 4
IRE bar is barely visible against the black background (0 IRE). There should be no
visible difference between the black background areas and the –4 IRE bar. This is a
secondary indication verses the 4 IRE bar, but can be useful in optimizing the black
level in displays that support blacker-than-black.
Next adjust the white level using the display’s contrast control. Adjust so that the 96
IRE bar is barely visible against the white (100 IRE) background. If a display supports
whiter-than-white, the 104 IRE bars may be visible. This is not a requirement, but does
show that there is some additional headroom above white.
If either or both the 4 IRE and/or 96 IRE bars cannot be seen after adjusting the
controls, recheck that the appropriate output level has been selected.
•
Grayscale, and gamma, should be calibrated at this point. Calibrating these parameters
is an essential part of the video calibration process. However, a trained technician using
the appropriate equipment must calibrate grayscale and gamma.
Grayscale calibration adjusts the “color of gray” so that the color “gray” adheres to the
industry standard D6500 point, at all levels from black to white. Most HDTVs, and
projectors, are intentionally miss-calibrated to maximize their brightness for the
showroom. This calibration step is necessary to correct this error, so the image appears
as the producers intended.
Gamma is the response curve between black and white and also has an industry defined
standard that should be followed. Lumagen has developed a unique 11-point parametric
grayscale/gamma calibration feature, which allows both grayscale and gamma to be
optimized over the entire range from black to white, and not just at one or two points.
Lumagen strongly suggests that a qualified video technician be hired to do grayscale
and gamma calibration. A technician with the proper training and equipment must do
the grayscale/gamma calibration. Contact Lumagen for the service codes necessary to
use the grayscale and gamma calibration features.
•
After completing the output calibration, copy the results to all configuration memories
using the following command:
MENU → IN → COPY → ALL → OK
•
It is a good idea to save the configuration before proceeding. Use the SAVE command
as shown below:
MENU → SAVE → SAVE → OK