Re: Photographer needs monitor recommendations (Eye-One/iCColor)
Re: Photographer needs monitor recommendations (Eye-One/iCColor)
- Subject: Re: Photographer needs monitor recommendations (Eye-One/iCColor)
- From: Terry Wyse <email@hidden>
- Date: Thu, 20 Nov 2003 12:12:35 -0500
Guys,
I don't think you're giving the Eye-One enough credit. In every test I've
done measuring reflective targets, the Eye-One is consistent to less than .5
delta E (much less actually). The only thing I can think of that might skew
your results would be the "geometry" or angle of the Eye-One relative to the
monitor when measuring the different corners of the display. I'm thinking of
the slight curvature of the display and possibly even the angle of the guns
as they strike the phosphers (but maybe once the phosphers are lit up the
gun angle is a moot point).
Different topic but regarding repeatability:
I did a test recently with my iCColor reading the same target 5 times in a
row and the difference was in the TENTHS of a delta E, like around .15-.20!
More iCColor trivia:
I've been wondering lately how many samples per patch the iCColor typically
makes when scanning a target. So, I yanked the top off the iCColor and
clocked it measuring several several rows of patches (I subtracted the paper
transport time). Basing my data on 100 samples/second (Gretag's specs), I
came up with around 20-30 measurements per patch on the IT8 and ECI2002
targets. Even if you cut this in half, that's still a lot of samples being
taken. This amount of sampling would have been unthinkable on my
Spectroscan!
Cheers,
Terry
on 11/20/03 9:57 AM, Andrew Rodney wrote:
>
on 11/20/03 7:25 AM, email@hidden wrote:
>
>
> In all fairness to the monitor in question these figures are a composite of
>
> the screen's variation with the spectro's variation with repeated readings,
>
> and
>
> possibly made worse by redefining white between each reading.
>
>
I figured the "science" wasn't all it was cracked up to be. It was
>
interesting to see (and with a more reasonable calculation using deltaE 94),
>
it's pretty decent. And we're using an average of 99 color readings. So this
>
entire experiment may be totally off kilter and not worth even
>
investigating. It would have been easier (and perhaps more useful) if I
>
could have had the EyeOne read a single color (like middle grey). But the
>
"Spot" function in Measure is reflective so that didn't work. I guess I
>
could try using Optical and it's advanced method whereby you call up a color
>
and measure. Would that be more useful???
--
__________________________________
WyseConsul
Color Management Consulting
v 704.843.0858
e email@hidden
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