Re: Monitor Calibration Quality Evaluation Protocol
Re: Monitor Calibration Quality Evaluation Protocol
- Subject: Re: Monitor Calibration Quality Evaluation Protocol
- From: Robin Myers <email@hidden>
- Date: Wed, 22 Jun 2005 10:07:54 -0700
Dear Mr. Ronald,
On 22 Jun, 2005, at 08:33, edmund ronald wrote:
Hi, folks !
As you know, I write a fair bit about color management, and I'd like
to get my opinions about LCD monitor calibration on a more solid
footing. So, I would like to establish a test protocol that I could
run on my machines to test calibrators. This is journalism, not rocket
science, but I still want to be able to do things decently.
I was thinking of first adopting a methodology similar to that of Dr.
Abhay Sharma for the WMU profiling review,
http://www.wmich.edu/ppse/staff/downloads/index.html
This means doing a whitepoint measurement and then computing delta E
for colorchecker squares. The evaluation results can then be the avg
and max delta E measured.
The instrumentation I now have is a Gretag Eyeone spectrophotometer. I
wonder whether this would be sufficient to act as a reference for this
purpose, seeing I'm doing journalism and not science? Also, I don't
know how to do the reading: Which software can put the instrument in a
state to read in the screen squares, then make measurements ? I guess
I need to somehow establish the base 100L value then compute the delta
E for each colorchecker square, can anyone tell me exactly how set up
software to do this ? It would be nice if Gretag offered some support,
eg. made their SDK available ...Maybe some existing package can
already do this ?
SpectraShop(tm) can do this. You can use the EyeOne to take emissive
readings from the LCD, then calculate the delta-E values for the
patches and the ColorChecker. You can download a demo version from
www.rmimaging.com. The program manual is included in the package.
The only part that is not exactly straightforward, but is still
possible, is the normalization step you mentioned. All the tools are in
SpectraShop to do this, but the exact steps are not spelled out.
Specialists will rightly assume I don't know what I'm doing; however,
Color Management is now trickling down to consumer level so we need
consumer-level testing of this type.
I am cross-posting to my photofeedback blog, at
http://photofeedback.blogspot.com so you can answer here or comment
there if you wish. I would appreciate input from all the professional
members of the community.
If you have any questions, please feel free to contact me.
Robin Myers
email@hidden
925-484-1065 (voicemail/fax)
925-519-4122 cellular
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