Re: Colorimeters and third-party developer support
Re: Colorimeters and third-party developer support
- Subject: Re: Colorimeters and third-party developer support
- From: Richard Wagner <email@hidden>
- Date: Mon, 22 Aug 2011 09:50:38 -0700
On Aug 22, 2011, at 2:47 AM, Roger Breton wrote:
> What's to protect against the inevitable drift,
> however? Can't it be argued that custom colorimeters will also drift over
> time? Will you want to pay $250 for an HP (i1displayII) to be recalibrate
> over time? Probably not. So where does one "draw" the line?
I'll send in my EyeOne Pro for re-calibration and certification, but I'm not sure that X-Rite even offers this service for colorimeters. If they did, it might even be wise to send new "retail" I1D2's in for calibration and certification. And the same for Spyders. Maybe a third-party calibration service is a potential new business for someone with the right stuff...
The methodology exists to re-calibrate colorimeters against a known standard, and that could be a certified eye-one pro if one does not have access to a research-grade instrument. In fact, this method could be used to "tune" many generic colorimeters for use with wide-gamut displays, or to improve the accuracy of aging or otherwise poorly performing i1 Displays and Spyders out there. What is missing is wide-spread software support. (Yes, Argyll can do this, as can PatchTool.) Is this method the ultimate in calibration and accuracy? Of course not, but it has the potential to move the ball closer to the end zone, so to speak, at low cost.
ASTM E1455
http://www.astm.org/Standards/E1455.htm
Four-Color Matrix Method for Correction of Tristimulus Colorimeters (Parts 1 and 2)
http://bit.ly/pcHaNS
http://bit.ly/pwhcD2
http://babelcolor.com/download/AN-9 How to derive and use a Color Correction Matrix.pdf
> See, that depends on the application, to me.
> But, ultimately, what are you going to trust more : your eye balls or some
> instruments cold numbers?
Eyeballs are fine, but if the numbers are out of whack, I'll re-check my eyeballs. Eyeballs (and the attached brain) are known to have been fooled, too, and they can become fatigued, lazy and complacent. Mine work best in the morning, after a cappuccino. After a long day in front of a monitor, or spent outside on a bright sunny day, forget it. Abnormal numbers also instruct the brain where to focus the eyeballs to look for problems or subtle differences. I think both are important and useful. If you find a "problem" with your eyeballs, how do you fix it? It's useful if your measurement device can "see" the same problem and give you the option to re-calibrate the monitor and/or re-build a profile to fix it. I'm not into visually editing ICC profiles.
--Rich
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden