Originally Posted by Pres2play
LiVal values attached!
Originally Posted by jrref
Here are my readings with the jeti 1501 at 4ft 9 inches from my 55A9F screen.
Look what is happening...
Four Color Matrix Procedure, measure W,R,G,B and calculate a 3x3 XYZ matrix. This matrix can be loaded inside your Klein for example (when you use ChromaSurf) or be 'software' loaded from LightSpace/CalMAN etc. when you will create that table using each software.
At this stage, the correction is for each colorimeter filters, so when you display and measure a White patch with a loaded correction, with simple words the R+G+B filter offsets are combined to give you the White correction offset. (basically the 3x3 table is active all the time, just I give an example)
All these work great with display with 3 subpixels (since the method developed with RGB displays), since when the panel will want to give you 100% White, it will light-up RGB subpixels...when you display a native blue, only the blue light-up....native red, only red light up etc.
With WRGB, we have a problem, because the W subpixel can light up when you display W or R or G or B, so this breaks the method. When you display White patch, 2 or 3 subpixels of 4 can light-up, the same can happen when you will display a primary.
For that reason I asked you to post these graphs.
Looking the Sony LCD (RGB) the colored spectra is the White measurement, while the wireframe is R+G+B spectral curves combined:
But to Sony OLED (WRGB) you see that there deviations between spectra of White spectra (colorful) vs. R+G+B (wireframes):
So from that difference you will have somewhere an error after meter profiling.
It has to do with the brand/model of the WRGB OLED you will measure where you will have the error. To some models you get error in Green Y, to other model to Red Y (more popular error), with LG 2016 OLED models you have no problem (not only to SDR but you have no problem with meter profiling verification if you try HDR meter profiling using 100% Luminance patterns also).
See an example with SDR verification here:
...and HDR verification here: