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Search: Posts Made By: spacediver
Forum: Display Calibration   05-18-2015, 10:30 AM
Replies: 9
Views: 262
Posted By spacediver
From Yoshi Ohno's...

From Yoshi Ohno's (http://www.nist.gov/pml/div685/grp03/ohno.cfm) chapter in Colorimetry: Understanding the CIE system....
Forum: Display Calibration   05-17-2015, 02:28 PM
Replies: 9
Views: 262
Posted By spacediver
I don't think this is correct, despite the...

I don't think this is correct, despite the nomenclature. See my thread here (http://www.avsforum.com/forum/139-display-calibration/1503933-spectrophotometers-spectroradiometers-i1-pro.html)
Forum: Display Calibration   05-14-2015, 09:29 AM
Replies: 25
Views: 373
Posted By spacediver
I thought DCI was 10 bit, not 12 bit. But looks...

I thought DCI was 10 bit, not 12 bit. But looks like it is 12 bit according to wiki (http://en.wikipedia.org/wiki/Digital_Cinema_Initiatives#Image_and_audio_capability_overview), although they say 10...
Forum: Display Calibration   05-14-2015, 09:25 AM
Replies: 36
Views: 555
Posted By spacediver
Your gamma is way way way off. The image must...

Your gamma is way way way off. The image must looked very washed out. See the white line in that graph? That's where the red green and blue lines should be lined up with. My advice would be to sort...
Forum: Display Calibration   05-12-2015, 07:51 AM
Replies: 229
Views: 11,724
Posted By spacediver
From another thread...

From another thread (http://www.avsforum.com/forum/138-avs-forum-podcasts/1533867-all-about-gamma.html#post24924641)
Forum: Display Calibration   05-11-2015, 05:51 PM
Replies: 13
Views: 470
Posted By spacediver
That's a shame. I was thinking it could operate...

That's a shame. I was thinking it could operate similarly to the way a CMOS or CCD camera sensor works, where radiance and time can be traded equally.
Forum: Display Calibration   05-11-2015, 10:50 AM
Replies: 13
Views: 470
Posted By spacediver
On the topic of integration time, I've been...

On the topic of integration time, I've been wondering if it's possible to extend the maximum integration time of the i1d3 to an arbitrary value. Presumably this would enable even lower luminance...
Forum: Display Calibration   05-08-2015, 08:22 AM
Replies: 229
Views: 11,724
Posted By spacediver
my apologies fluxo, seems that I may have been...

my apologies fluxo, seems that I may have been the one making a thinking error here :)
Forum: Display Calibration   05-07-2015, 09:34 PM
Replies: 229
Views: 11,724
Posted By spacediver
the part that confuses me is that linearity can...

the part that confuses me is that linearity can be defined with respect to luminance, or with respect to some other quantity. If an EOTF creates a perceptually uniform relationship between adjacent...
Forum: Display Calibration   05-07-2015, 09:00 PM
Replies: 10
Views: 236
Posted By spacediver
They're circular patches on a background of pure...

They're circular patches on a background of pure black.
Forum: Display Calibration   05-07-2015, 08:56 PM
Replies: 229
Views: 11,724
Posted By spacediver
interesting, it seems I've had a reversed...

interesting, it seems I've had a reversed understanding of what R'G'B' actually entails.
Forum: Display Calibration   05-07-2015, 09:23 AM
Replies: 229
Views: 11,724
Posted By spacediver
I don't see how anything I've written contradicts...

I don't see how anything I've written contradicts this. I never claimed BT.1886 to be a universal EOTF (I'm not even sure what a "universal EOTF" would even mean).
Forum: Display Calibration   05-07-2015, 01:38 AM
Replies: 229
Views: 11,724
Posted By spacediver
Hopefully someone else can help you out here, but...

Hopefully someone else can help you out here, but perhaps going back to the definition of an EOTF might help (the E, referring to the electrical domain, is what is proportional to V)*. Also see...
Forum: Display Calibration   05-07-2015, 12:56 AM
Replies: 229
Views: 11,724
Posted By spacediver
The BT.1886 EOTF doesn't specify any particular...

The BT.1886 EOTF doesn't specify any particular "signal". As I understand it, video input level is something basic and fundamental to a display. I think it makes sense to think of things like luma...
Forum: Display Calibration   05-06-2015, 11:05 PM
Replies: 229
Views: 11,724
Posted By spacediver
The document doesn't need to exclude such a...

The document doesn't need to exclude such a possibility, because "input video signal level" means one and one thing alone. You're making a category error here I think (which could probably be...
Forum: Display Calibration   05-06-2015, 10:38 PM
Replies: 229
Views: 11,724
Posted By spacediver
not sure what (... X ...) signifies. Not sure if...

not sure what (... X ...) signifies. Not sure if this helps you, but the gamma corrected R'G'B' doesn't refer to any particular gamma function or EOTF, but they're meant to imply that the values are...
Forum: Display Calibration   05-06-2015, 10:30 PM
Replies: 10
Views: 236
Posted By spacediver
I just created a test pattern. It has a black...

I just created a test pattern. It has a black background, and three circles in a vertical column. The top circle is RGB [1 1 1], the second is [2 2 2], and the third is [3 3 3].

On my FW900, which...
Forum: Display Calibration   05-06-2015, 10:04 PM
Replies: 229
Views: 11,724
Posted By spacediver
You're thinking about this in the wrong way....

You're thinking about this in the wrong way. There are not multiple possible ways of characterizing the video input signal level, there is just one (although I suppose normalizing it to 0 to 1 is an...
Forum: Display Calibration   05-05-2015, 12:58 PM
Replies: 4
Views: 193
Posted By spacediver
thanks!

thanks!
Forum: Display Calibration   05-05-2015, 12:30 PM
Replies: 4
Views: 193
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: 233
Views: 7,398
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: 26
Views: 732
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: 233
Views: 7,398
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: 233
Views: 7,398
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: 233
Views: 7,398
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...
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