A
ccurate color reproduction depends on how well the
projector’s red, green, and blue primary colors match
the SMPTE C standard phosphors, combined with the
accuracy of the white-point color temperature. The projector ’s
white point has been calibrated to match the D65 standard
white-point at 75 IRE. The projector’s primary and complimen-
tary (yellow, magenta, cyan) colors (circles) are compared to
the SMPTE C standard colors (squares) on the CIE diagram.
Changes in the grayscale color temperature will shift the posi-
tion of the complimentary colors and the color accuracy.
The Runco DTV-930 RGB color triangle almost completely
overlaps the SMPTE triangle so nearly all colors in the video
signal can be reproduced. The blue and green primary colors
are close to the SMPTE standard phosphors and the red pri-
mary is shifted to the right. The resulting color accuracy is
excellent.
The green primary of the Sony VPH-G90U is shifted toward
ye l l ow. This results in a gap of non-reproducible colors
between its RGB color triangle and the SMPTE C triangle. The
cyan color is desaturated (shifted toward white) and magenta
is shifted toward blue.
If the VPH-G90U color temperature is lowered by moving
the white point slightly toward red during calibration, the
resulting color accuracy will be significantly improved with bet-
ter skin-tones and more accurate purples. The eye is more sen-
sitive to errors in blues and purples than it is to equal distance
errors in yellow or cyan on the CIE diagram.
formats can be selected directly from the remote
control. The entire 100 picture formats can be
selected by an on-screen menu that shows the
memory number, name, video source and date
created. When a memory is selected the source
is switched and the display is setup with all of
the individualized calibration settings for that picture. The
memories can be copied, moved, deleted and renamed for
selection convenience or to expedite creating new entries.
Although 100 memory set-ups may seem like overkill, 10-
20 wouldn’t be enough for me. You will need separate memo-
ries for 4:3, 4:3 letterboxed, and 16.9 enhanced aspect ratios,
and I have special set-ups for 1.66:1 and 1.85:1 movies. Most
of these are duplicated again for a doubler, tripler, quad, com-
posite video, S-Video, and my 3Dfusion progressive-scan DVD
player that has a 72 frame-per-second output. Then add 720p
and 1080i for HDTV and several set-ups for computer dis-
plays. Finally I have some special picture formats for watch-
ing 4:3 sports presentations cropped and expanded to fill the
entire 1.85 screen. You may also want to keep a duplicate set
of everything just in case you accidentally mess something up
while tweaking.
Each memory has a counter and a timer to keep track of
how many times it is used and for how many hours. This is
convenient for knowing how much time you’ve used the CRTs
for watching 4:3 pictures or widescreen pictures. Two sets of
timers, one that can be reset by the user, are also included for
total CRT and projector hours.
Color temperature can be selected from 3200K, 5400K,
6500K, 7500K, and 9500K for special applications. Incoming
Convergence Labs Test Report
Greg Rogers
