Originally Posted by fluxo
Could you elaborate on that, please?
I was under the impression that external content would invariably pass through the TV's colour management system, whether provided via a LUT or more directly from a source device (e.g., BDP). That is, there is no way of bypassing or disabling the CMS as a whole, although certain TV menu control values might disable certain functional elements of it.
An interesting possibility is that certain menu values might create optimal a conditions under which to use external compensation with a LUT. Unfortunately, given a lack of a deep understanding of how LG's CMS works, we are unlikely to be able to identify those conditions.
It is simple, just like a normal 1D calibration. First you set your pre calibration, this is done using the internal controls of the display.
Then you measure a set of color triplet patches (imo at-least 2500 patches) that are displayed on the TV/CMS screen you are going to use the 3DLUT for, this is called profiling. Once you have completed the profile you use the profile to create a 3DLUT, depending on the external processor and software you are using can create 65000 reference color points.
So like a normal 1D calibration taking screen patch measurements of RGBCMY using 100% stimulus level (or whatever level works best for all 6 points), you are now using many more different reference color point patches (windows or full screen) at many more stimulus levels, all the time taking readings from how the display's CMS is displaying the color patches.
Originally Posted by fluxo
Speaking as a scientist for a moment - or rather an ageing senile member of the species - I am somewhat struck by the absence here of something that is commonplace in the sciences, and that is a mathematical model. When one is trying to understand some phenomenon, the first step is often to make observations and take measurements and the second to plot graphs etc. What is missing here is the third step and that is the mathematical model. If we had such a model of LG's CMS implementation, then it is just possible we might be able to, e.g., set up a set of equations and solve for an optimal solution. Take a handful of readings, plug them into the model and then find a menu control set solution - it's not impossible to imagine. That might sound far-fetched, implausible and even alien here, because it is an approach that is not found within the standard calibration workflows. But it is the type of approach that is very common in the sciences and engineering.
This is exactly what profiling and creating a 3DLUT does, your 1st, 2nd and 3rd step.
Understanding that these displays have millions of different colors, in most cases just setting a few correction color points
only give the CMS very limited reference points, so in theory the more reference color point for the CMS the more the CMS has to work with.
A owner of a LG OLED is learning how to make a profile and 3DLUT using a HTPC, I posted a few days ago about this and a link. Here is a link for that thread https://www.avsforum.com/forum/139-di...l#post32829545
In the last few pages you will see grafts and charts of how this is working for his LG OLED. The only two draw backs are he is just using a D3 color meter and very good software, but the latest version is in the beta stage. The user is "Pepelegal".
In a nut shell, the LG OLED is doing very nicely when the 3DLUT is used. The only problem and its not that big of a problem is Blue being slightly under saturated . But keep in mind the DIY is using just a D3 color meter and learning a new beta software. So Blue may not be under saturated.
You may want to click on this link. http://argyllcms.com/index.html