[Tig] MacBook Pro colorimetry

[Jeremy Pollard]

Rob, picking up on your query about achieving a good sRGB (or other video standard) calibration on
your laptop, there exist some specialised industry solutions intended to achieve exactly this goal. 
  One major challenge standing in the way of achieving good results with notebook LCDs, however, is 
their tendency to exhibit a high "decoupling error".  In simple terms, this means that the R, G and 
B components are not completely independent, resulting in changing colour casts along a grey ramp.

The upshot of this behaviour is that it's not physically possible to correctly calibrate such a
display using 1D LUTs, which many basic monitor calibration tools rely on.  An accurate result is
only possible if you're able to compensate for this interdependence between colour components, which
generally means using 3D LUTs.

[For those interested in the details, the topic of decoupling error is covered in this white paper:
http://cinespace.risingsunresearch.com/docs/ColourManagement.pdf]

So how do you solve the issue?  Either use a different display that has a low decoupling error, or
calibrate using 3D LUTs.

Disclaimer: I'm a representative of RSR, a developer of film colour management solutions.

---
Jeremy Pollard
Rising Sun Research (RSR)
---
jeremy.pollard at risingsunresearch.com
http://cinespace.risingsunresearch.com

Rob Lingelbach wrote:
> TIGNABFS08 - NAB for 2008
> http://colorist.org/wiki3/index.php/TIGNABFS08
> Thanks to Cintel for support in 2008
>  ====
> 
> 
> 
> On Feb 4, 2008, at 2:12 PM, Lewis Saunders wrote:
> 
>> Because the color management is being disabled :)  I'm not sure why
>> all those profiles appear in Display Prefs... half of them are
>> working spaces rather than monitor profiles, so have basically no
>> effect.
> 
> I noticed that too. But if in the Display Profile Manager you click
> the box "show profiles for this display only" the other ones go away.
> So that's a hint that "Display" could include printers, wide-gamut
> monitors, etc. On my PowerBook G4 15", the default display profile
> under Tiger was Color LCD. I found going to sRGB brought the LCD much
> more in tune with typical computer displays, though I had to calibrate
> it to 2.2 gamma, the default sRGB was a bit off.
> 
> Even after doing this, there is a slight blue cast at 60 to 70% white
> level (not due to white color point - am using D65). Does anyone know
> of a good tool to LUT-imize the notebook LCD so that I can correct for
> this problem?
> 
> --
> Rob Lingelbach
> rob at colorist.org   http://www.colorist.org
> 
> 
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