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Forum: Display Calibration   12-26-2014, 10:29 AM
Replies: 114
Views: 10,108
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, 04:43 PM
Replies: 6
Views: 161
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, 06:41 PM
Replies: 4
Views: 328
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, 10:50 AM
Replies: 4
Views: 328
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, 11:56 AM
Replies: 5
Views: 104
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, 11:10 AM
Replies: 5
Views: 104
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, 10:40 PM
Replies: 18
Views: 1,041
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, 10:22 AM
Replies: 60
Views: 2,421
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, 09:10 PM
Replies: 7
Views: 362
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, 01:07 PM
Replies: 60
Views: 2,421
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, 11:43 AM
Replies: 60
Views: 2,421
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, 11:34 AM
Replies: 9
Views: 244
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, 10:30 PM
Replies: 60
Views: 2,421
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, 03:23 PM
Replies: 60
Views: 2,421
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, 09:28 PM
Replies: 60
Views: 2,421
Posted By spacediver
are we arguing semantics here?

are we arguing semantics here?
Forum: Display Calibration   11-13-2014, 03:12 AM
Replies: 60
Views: 2,421
Posted By spacediver
Finally, a statement that I can somewhat agree...

Finally, a statement that I can somewhat agree with in principle. Without extensive psychophysical experiments, it's hard to ascertain the degree to which BT.1886 succeeds in maintaining a...
Forum: Display Calibration   11-12-2014, 11:15 PM
Replies: 60
Views: 2,421
Posted By spacediver
I think you meant to say "appendix". The annex is...

I think you meant to say "appendix". The annex is the standard.
Forum: Display Calibration   11-12-2014, 04:22 PM
Replies: 60
Views: 2,421
Posted By spacediver
No it isn't simple logic. Let me try to explain...

No it isn't simple logic. Let me try to explain it to you very simply, using video level 1 and 2 as an example:

Suppose you have a perfect black level (i.e. 0 nits).

Video level 1 = 0 nits.
...
Forum: Display Calibration   11-12-2014, 04:01 PM
Replies: 60
Views: 2,421
Posted By spacediver
Exactly, yet what you have consistently failed to...

Exactly, yet what you have consistently failed to understand is that this "lifting of the shadows" - in other words, the "stretching of luminance" between successive video levels - is actually...
Forum: Display Calibration   11-12-2014, 01:21 PM
Replies: 60
Views: 2,421
Posted By spacediver
Assuming your viewing environment meets reference...

Assuming your viewing environment meets reference viewing conditions, it ultimately depends on the content. BT.1886 has been THE standard since 2011, however there is plenty of material prior to this...
Forum: Display Calibration   11-12-2014, 01:15 PM
Replies: 60
Views: 2,421
Posted By spacediver
This is simply wrong, and it seems Steve has yet...

This is simply wrong, and it seems Steve has yet to grasp the math and or perceptual logic behind BT.1886, and is still stuck in the thinking displayed here:
...
Forum: Display Calibration   11-11-2014, 12:21 PM
Replies: 11
Views: 420
Posted By spacediver
the gamma slider. Depending on how the other...

the gamma slider. Depending on how the other functions work, it may be possible to change the shape of the line, but not sure.

Your best bet is to invest in a colorimeter.
Forum: Display Calibration   11-11-2014, 11:12 AM
Replies: 11
Views: 420
Posted By spacediver
as for software/instruments, these threads may...

as for software/instruments, these threads may help:

http://www.avsforum.com/forum/139-display-calibration/1745857-best-calibration-setup-software-meter-around-200-a.html
...
Forum: Display Calibration   11-11-2014, 10:49 AM
Replies: 11
Views: 420
Posted By spacediver
Look at the images in this post...

Look at the images in this post (http://hardforum.com/showthread.php?p=1041045250#post1041045250).

Ignore the blue lines - just look at the yellow lines. Ideally, you want that to be flat.

The...
Forum: Display Calibration   11-11-2014, 10:22 AM
Replies: 11
Views: 420
Posted By spacediver
also, if your gamma isn't flat to begin with,...

also, if your gamma isn't flat to begin with, then no amount of sliding in the nvidia control panel will produce a flat gamma - it will only shift it up or down.
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