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i1 Pro DCS Testimonials:
"If you combine the EyeOne
Pro
(the best affordable color device IMO) with Jeff Meier's
DCS
calibration software (the best cal software IMO) then you have all the tools you
need to do your own accurate calibrations." KenLand - AVS Forum
"...The AccuCal / Beamer combination really is the best bang for the buck. It
makes for quick and accurate measurement. I have never seen such uniform grey
ramps as I have now. Color and contrast are mind blowing. I am pleased."
bberns22 - AVS Forum
"...As the baseline for comparing the readings I took a luminance reading
(emissive / pointed at the screen) of the PJ from a distance of 10' and from the
viewing angle of the Prime Seat. (I covered all the LEDs in the equipment in the
room first.) Then I mounted the sensor about 2' from the PJ pointed at the PJ. I
used Jeff's
DCS software to put the sensor in
"Ambient" mode and compute the
proper x,y offsets
so that the ambient measurement matched the previous emissive measurement. I
took the ambient baseline measurement before and after the measurement run with
the sensor mounted in a tripod. The two readings were identical down to .0000.
I compared the 20 readings for x to the baseline reading for x and the 20 y
readings to the baseline reading for y. I found a very large sweet spot where
the sensor was very linear. This sweet spot went from about 20K lux down to
about 180 lux. This is a large enough dynamic range to measure 100-10 IRE at a
2.2 gamma easily. The maximum deviation from the baseline in x was .0007 and in
y was .0006. The average deviation was .00035 in both x and y.
In this configuration, the Eye-One shows exceptional linearity in a large enough
dynamic range that it can measure from 100 IRE to 10 IRE.
I have done a similar comparison in Emissive mode and the Eye-One does not have
the same kind of exceptional linearity or stability at lower light levels.
However, with my SP7200
producing 11.5 fL off the
screen, the Eye-One with
DCS was sufficently
linear down to 30 IRE and it was usefull in measuring 20 IRE by averaging
several readings, which is what I have to do at 20 IRE with my trichromat probe
also.
With Plasmas and bulb based RPTVs
producing much
greater levels of luminance than 11.5 fL at White, the Eye-One with
DCS should be able to measure down to 30 IRE with
accuracy. At 20 IRE, one has to be mindful of how consistent the readings are
before relying on them.
Edit: I thought that I might add that SMPTE standards for
professional broadcast monitors is that they be
calibrated to within .004 x,y of D65. That puts the Eye-One's performance into
perspective. At least with a DLP PJ, it can track 100 IRE to 10 IRE with an
average deviation of only .00035 (which is only 9% of .004 - the allowable
deviation.)
Glenn " glenned - AVS Forum
"I was fortunate enough to be able to compare my Gretag Macbeth EyeOne
Pro using Jeff Meier's (umr)
DCS Pro software to a Lightspex
Spectroradiometer. The Lightspex is a laboratory grade instrument for measuring
color.
We used a Sony PVM-96 D65 broadcast monitor.
Anyway, I didn't take a lot of readings, but at 100IRE the EyeOne matched the
Lightspex to the fourth decimal place.
EyeOne measured .3114 .3245
LightSpex measured .3109 .3248
That's virtually identical. (Delta .0005 and -.0003) (!!!)" KenLand - AVS Forum
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