Re: Photographer needs monitor recommendations
Re: Photographer needs monitor recommendations
- Subject: Re: Photographer needs monitor recommendations
- From: Andrew Rodney <email@hidden>
- Date: Thu, 20 Nov 2003 10:39:00 -0700
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.
OK, so what I did this time was make a 50% gray document in Photoshop and
put it in full screen mode. Switch to MeasureTool and use a spot reading on
screen with the EyeOne in the center as my reference, then all four corners.
The Artisan was set for a native TRC gamma, 6500K and 500:1 contrast ratio.
With the "standard" deltaE (not deltaE 94) I get the following differences
from center:
Upper right: 0.8 deltaE
Lower right: 0.8 deltaE
Upper left: 0.9 deltaE
Lower left: deltaE of 0.7
Note that if you put the EyeOne (or any measuring device) too close to
either the upper left or right, you get farther readings because there's a
white menu from MeasureTool. I suspect that some "fall off" of that white
might affect the readings. Using Spot in MeasureTool does allow you to place
the tip of the Eyeone much closer to the corners (you don't have the issue
with how far the measurement window can get to the corners).
As David was correct in predicting, there is a bit of fudge factor based on
just the instrument. For example, if I click the EyeOne in the exact same
spot repeatedly, I see a difference of about.02 deltaE each time. So there
is some variation in the measurements with such a device (but that's pretty
low). Plus we're seeing less than a deltaE of one over all four corners from
center which ain't bad!
Also, the above values can change doing the test multiple times of course
since where you exactly place the EyeOne plays a role. The "worst" test was
showing a value of a tad over deltaE of one (but it's not easy to repeat the
tests and get any kind of consistency at this low level).
Again, the science may be flawed...
Andrew Rodney
http://www.imagingrevue.com/
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