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Forum: Display Calibration   03-21-2015, 11:13 PM
Replies: 139
Views: 4,076
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: 212
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: 212
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: 139
Views: 4,076
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: 241
Views: 8,749
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: 241
Views: 8,749
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: 675
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: 241
Views: 8,749
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: 2,839
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...
Forum: Direct View (single tube) CRT Displays   12-31-2014, 04:30 PM
Replies: 1
Views: 66
Posted By spacediver
answered here...

answered here (http://hardforum.com/showthread.php?t=1846998)
Forum: Display Calibration   12-26-2014, 09:29 AM
Replies: 114
Views: 11,128
Posted By spacediver
BT.1886 is not meant to be flat, unless you have...

BT.1886 is not meant to be flat, unless you have a min luminance of exactly 0 nits.
Forum: Display Calibration   12-17-2014, 03:43 PM
Replies: 6
Views: 205
Posted By spacediver
looks like an excellent deal to me, although it...

looks like an excellent deal to me, although it ends in 5 hours :)
Forum: Display Calibration   12-09-2014, 05:41 PM
Replies: 4
Views: 349
Posted By spacediver
yea, I can't stand ftl :) The following is...

yea, I can't stand ftl :)

The following is my current understanding of luminance and illuminance measurements - I might be off in some details:

The geometry of measuring luminance means that...
Forum: Display Calibration   12-09-2014, 09:50 AM
Replies: 4
Views: 349
Posted By spacediver
Lux is a measure of illuminance, and ftl is a...

Lux is a measure of illuminance, and ftl is a measure of luminance.

I think you can only do the pi conversion when the surface being measured is perfectly diffuse.
Forum: Display Calibration   11-30-2014, 10:56 AM
Replies: 5
Views: 123
Posted By spacediver
ah, I took it to mean he wanted help figuring out...

ah, I took it to mean he wanted help figuring out which controls to use, but you may be right.
Forum: Display Calibration   11-30-2014, 10:10 AM
Replies: 5
Views: 123
Posted By spacediver
I may be missing something, but the user never...

I may be missing something, but the user never asked (http://www.avsforum.com/forum/139-display-calibration/1783122-toshiba-ct-90405-calibration.html) for others to share display settings. Robboadam...
Forum: Display Calibration   11-24-2014, 09:40 PM
Replies: 18
Views: 1,186
Posted By spacediver
One thing I've been wondering about more recently...

One thing I've been wondering about more recently is the type of sensors used (e.g. CMOS, CCD). Do the properties of the sensors themselves change over time (i.e. their sensitivity and/or spectral...
Forum: Display Calibration   11-24-2014, 09:22 AM
Replies: 60
Views: 2,932
Posted By spacediver
Yes, this is exactly what BT.1886 is meant to do....

Yes, this is exactly what BT.1886 is meant to do. Not sure why you feel this is surprising.



You shouldn't be choosing an EOTF based on what the average gamma is. But if you prefer the look of...
Forum: Display Calibration   11-23-2014, 08:10 PM
Replies: 7
Views: 429
Posted By spacediver
Interesting question, and one worth...

Interesting question, and one worth investigating.

I'm no professional calibrator, don't even own a tv, but total stab in the dark guess would be around 5-7 percent, and I wouldn't be surprised if...
Forum: Display Calibration   11-23-2014, 12:07 PM
Replies: 60
Views: 2,932
Posted By spacediver
Indeed, which is where the art of intelligent...

Indeed, which is where the art of intelligent mastering comes into play (and also why we ideally want more bits to work with). And if you raise those levels so they aren't crushed in brighter...
Forum: Display Calibration   11-22-2014, 10:43 AM
Replies: 60
Views: 2,932
Posted By spacediver
Given the reality that consumer displays have...

Given the reality that consumer displays have variable contrast ratios, BT.1886 is a necessary step towards an "ideal" standard. There is no perfect EOTF that can create an ideal match between...
Forum: Display Calibration   11-22-2014, 10:34 AM
Replies: 9
Views: 289
Posted By spacediver
Cpkeeper (http://goebish.free.fr/cpk/) may do the...

Cpkeeper (http://goebish.free.fr/cpk/) may do the trick. From the readme:
Forum: Display Calibration   11-21-2014, 09:30 PM
Replies: 60
Views: 2,932
Posted By spacediver
keep in mind that while BT.1886 accelerates the...

keep in mind that while BT.1886 accelerates the luminance function at the low end (relative to a power-law), it decelerates at the high end (relative to a power-law). It's important to keep in mind...
Forum: Display Calibration   11-20-2014, 02:23 PM
Replies: 60
Views: 2,932
Posted By spacediver
sRGB is a bit of a messy affair: Read p 51...

sRGB is a bit of a messy affair:

Read p 51 and p 323 here...
Forum: Display Calibration   11-13-2014, 08:28 PM
Replies: 60
Views: 2,932
Posted By spacediver
are we arguing semantics here?

are we arguing semantics here?
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