Re: Color matching

Gernot Hoffmann wrote:
Roger Breton schrieb:

Tom,

Didn't you use to have a series of PDF on the old sequel.com site that
explained some of the math behind screen color calibration and matching?

Roger

Mr. T.L. didn't ever publish any scientific stuff in the Web,
as far as I know.
He's knowing everything, but he doesn't share the knowledge ...

Best regards --Gernot Hoffmann

Actually, Gernot, I did have a full set of pdf white papers that were on the old sequel site. They were generated as the result of a high school student's question to me on this forum years ago. Some of these papers went through a lot of matrix math and showed examples how matrix math can be used to solve real world problems. I got a lot of satisfaction from letters that I got back from high school and some college folks for showing real world examples, numerically worked out. There were also some papers on Color Temperature and why it is a very bad way to describe color. When the Sequel Website disappeared, much of that disappeared, although I think there is a directory on an old ftp mirror...I'll have to check. If you want them, just drop me a line at tlianza AT xrite DOTCOM and I will try to dig them up...

What I never did publish was the mechanism used to determine a display lut via inverse look up and how one could simultaneously derive RGB luts from measurements of simple gray scale data on a display. That was really good work and I did that when I first founded Sequel. The reason for this is that it would basically require a chapter in a book to describe the process fully. I am trying to get a display calibration application with all that technology into Open Source, but it is proving to be a bit of a challenge. The code has to be reformed using Open Source Math libraries and Open Source USB libraries and I just don't have the time to personally re write it, but if a college student or two wanted to take on a little project, I'd be glad to help them. I try to help educators and students whenever I can.

When I owned the company, Sequel Imaging, I put quite a bit of information up on the site in the White papers section. Now that all that technology is owned by Xrite, I am not free to just throw up white papers when ever I feel like it.

Now as far as Mr. T.L. not publishing on the Web...the web is filled with sites that present information, some correct, some incorrect. Many are tainted by the author's prejudices and lack of knowledge ( I won't use names here...). They are not peer reviewed and they are often simply wrong. I don't need to stroke my ego by playing, part time in this space. I normally just refer people to bruce lindbloom's site, for color information www.brucelindbloom.com . I could never do a better job than Bruce. That site is labor of love by someone who loves his field. What the web doesn't need is another generalist publishing non-peer reviewed information.

What Mr. T.L. does do is send between 10-20% of his pre-tax salary to direct aid to one or two graduate students in the field of color science or image science. I'm sharing my knowledge and my money, these days, one student at a time... that's how I choose to make a difference.

Regards,
Tom Lianza
.

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