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Search: Posts Made By: spacediver
Forum: Display Calibration   05-05-2015, 12:58 PM
Replies: 4
Views: 149
Posted By spacediver
thanks!

thanks!
Forum: Display Calibration   05-05-2015, 12:30 PM
Replies: 4
Views: 149
Posted By spacediver
who was that engineer responsible for the i1 display pro design?

I remember hearing about a very talented engineer at X-Rite who was responsible for the design of the i1d3. Does anyone know his or her name?
Forum: Display Calibration   05-04-2015, 01:21 PM
Replies: 227
Views: 6,981
Posted By spacediver
They did not use the 1976 CIELab delta E, and...

They did not use the 1976 CIELab delta E, and they explained why. They stuck with delta uv. I'm not sure why you think this is hypocritical or inconsistent of them, let alone "juicy".
Forum: Display Calibration   05-01-2015, 08:44 PM
Replies: 16
Views: 381
Posted By spacediver
That's because this is BT.1886, not 2.4 gamma :p ...

That's because this is BT.1886, not 2.4 gamma :p



My calculations show that with your contrast levels, a BT.1886 curve will yield a point gamma of 2.21 at the 50% video input level, so your...
Forum: Display Calibration   04-23-2015, 07:10 PM
Replies: 227
Views: 6,981
Posted By spacediver
There's also another important point that you're...

There's also another important point that you're not considering. Even if metamerism results in a given error, calibration is still important for maintaining consistent grayscale tracking. It could...
Forum: Display Calibration   04-23-2015, 06:12 PM
Replies: 227
Views: 6,981
Posted By spacediver
I really don't have the energy to parse these...

I really don't have the energy to parse these questions. Please try and rephrase with clarity. I get the feeling you don't quite understand the colorimetry behind observer metamerism, which may...
Forum: Display Calibration   04-23-2015, 12:43 PM
Replies: 227
Views: 6,981
Posted By spacediver
It depends upon what parts of the individual's...

It depends upon what parts of the individual's CMF vary the most relative to the 1931 observer, and what parts of the spectrum the narrow primaries of the display lie at. You could write some code to...
Forum: Display Calibration   04-23-2015, 08:33 AM
Replies: 227
Views: 6,981
Posted By spacediver
Not really. If you understand the mechanisms of...

Not really. If you understand the mechanisms of observer metamerism, it becomes pretty clear why certain metamers are less stable than others.



This isn't new information, and you seem to think...
Forum: Display Calibration   04-22-2015, 09:17 PM
Replies: 227
Views: 6,981
Posted By spacediver
I'm not sure how this latest paper is at all...

I'm not sure how this latest paper is at all relevant to the question of whether the white point correction is a solution.



That's not really juicy. They chose not to use dE because of the...
Forum: Display Calibration   04-22-2015, 09:10 PM
Replies: 227
Views: 6,981
Posted By spacediver
I'd be surprised if that paper made peer review....

I'd be surprised if that paper made peer review. No data about observer repeatability. No control condition to see whether observers could reliably match two CRTs or two LCDs together, so it's...
Forum: Display Calibration   04-22-2015, 07:33 PM
Replies: 227
Views: 6,981
Posted By spacediver
The white point correction would never solve the...

The white point correction would never solve the issue of observer metamerism.
Forum: Display Calibration   04-22-2015, 05:42 PM
Replies: 227
Views: 6,981
Posted By spacediver
right, forgot about this one :) that'd be...

right, forgot about this one :)

that'd be fantastic. Spectrophotometric imaging with high spatial resolution seems like a tricky proposition, but I bet there are some people already researching...
Forum: Display Calibration   04-22-2015, 01:04 PM
Replies: 227
Views: 6,981
Posted By spacediver
Observer metamerism is nothing new, nor is the...

Observer metamerism is nothing new, nor is the knowledge that narrow bandwidth primaries exacerbate it. The CIE standard observer is not broken, it is simply imperfect, as will any standard...
Forum: Display Calibration   04-11-2015, 08:08 AM
Replies: 227
Views: 6,981
Posted By spacediver
I asked a question, I didn't attack you. I wanted...

I asked a question, I didn't attack you. I wanted to see if you understood the basics of a CMF. Based on your response, I assume that you do.

Next question:

What is observer metamerism? And...
Forum: Display Calibration   04-10-2015, 05:09 PM
Replies: 227
Views: 6,981
Posted By spacediver
Harlekin, in your own words, what is a color...

Harlekin, in your own words, what is a color matching function, and how is it empirically derived?
Forum: Display Calibration   04-03-2015, 08:49 AM
Replies: 227
Views: 6,981
Posted By spacediver
PR person? Tom Huffman is the designer,...

PR person? Tom Huffman is the designer, programmer, and I believe owner of Chromapure. He is not a "PR person".
Forum: Display Calibration   03-21-2015, 11:13 PM
Replies: 227
Views: 6,981
Posted By spacediver
It's also pretty clear from that quantum dot...

It's also pretty clear from that quantum dot thread that the poster in question lacked even a basic understanding of colorimetry.
Forum: Display Calibration   03-14-2015, 02:29 PM
Replies: 11
Views: 237
Posted By spacediver
Yes, I believe so. In the normal use of the term...

Yes, I believe so. In the normal use of the term "colorspace", the RAW image has no colorspace until either an editor weights/demosaics or until the camera software itself does the same...
Forum: Display Calibration   03-14-2015, 12:02 PM
Replies: 11
Views: 237
Posted By spacediver
These are really good questions, and I don't have...

These are really good questions, and I don't have a solid grasp on them, but I'll attempt to shed some light, and hopefully others who have sharper knowledge can improve upon or correct my reply.

...
Forum: Display Calibration   03-11-2015, 09:36 PM
Replies: 227
Views: 6,981
Posted By spacediver
I think this about sums up the bulk of this...

I think this about sums up the bulk of this individual's postings.
Forum: Display Calibration   03-09-2015, 05:37 PM
Replies: 352
Views: 12,090
Posted By spacediver
Yes, 0.0002 foot lamberts is roughly 0.0006 nits...

Yes, 0.0002 foot lamberts is roughly 0.0006 nits (cd/m^2)
Forum: Display Calibration   03-09-2015, 03:20 PM
Replies: 352
Views: 12,090
Posted By spacediver
The specs...

The specs (http://www.colorimetryresearch.com/products/cr-110) indicate a minimum reading of 0.0006 nits with a 20 second exposure, but it might go lower.



See this thread...
Forum: Display Calibration   03-09-2015, 03:05 AM
Replies: 3
Views: 695
Posted By spacediver
wow just saw this post just now, sorry for not...

wow just saw this post just now, sorry for not getting back to you earlier.

I've just read through the link. I believe the method will work if the display you are measuring has perfect tracking...
Forum: Display Calibration   03-09-2015, 02:56 AM
Replies: 352
Views: 12,090
Posted By spacediver
nice, that's with the 20 second exposure right?...

nice, that's with the 20 second exposure right? Your display might be even blacker than that, given that 0.0006 is the lowest the colorimeter can read. I'd love to compare this colorimeter against my...
Forum: Display Calibration   02-23-2015, 03:56 PM
Replies: 52
Views: 2,930
Posted By spacediver
somewhat relevant, I ended up using a DSLR to...

somewhat relevant, I ended up using a DSLR to measure my display's black level - got around 0.0006 cd/m2. Writeup over here...
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