Originally Posted by AustinJerry
I am having a friendly discussion in a separate thread regarding the proper way to set the Advanced Color Temperature settings using CalMAN 2016. Please help me clear up my confusion.
My previous Sony displays have only had the 2-point grayscale adjustments. My current Sony (XBR-X940D) now has a 10-point adjustment as well. To set the white balance, I have been first configuring the 2-point settings, and then advancing to the Multipoint grayscale settings to fine-tune the results.
My friend says that if I use the 10-point adjustments, I can skip the 2-point adjustments altogether. My questions are: is this correct, i.e. are the 2-point adjustments no longer necessary? And second, if I do use the 2-point adjustments, the validity of the final results after adjusting the Multi-point settings as well are not affected, are they?
When you have both available RGB-Balance calibration controls (2-Point + 10-Point) then you will always have better results when you will use both of these controls.
Start with 2-Point RGB-Balance and use 100% White and 30% Gray or 5% Gray (if you have a panel where it's 5% Gray adjustment is producing problems to near black performance...and it's better to leave it untouched...like LG OLED's for example).
After multi-passes of these 2 points....move to 20-Point for micro adjustments. The reason why you will have better results are a lot...you will save a lot of time of additional adjusting because when you do 2-Point first, the 20-point will require less adjustment from step to step....also it's always better to use as less adjustments of calibration controls as possible because consumer TV electronics are not working so great and there a lot of time where large adjustments are producing problems to the image (beyond post-calibration measurements...not visible there...since you measure only a few points), your image will look less processed when you use less calibration controls changes. Display companies they are not paying much attention to provide excellent calibration controls because this will increase it's manufacturing cost, since the reality is that only a small percentage of people are calibrating their sets...most of them are just using the factory default settings.
Additionally, to provide even better final result, use similar adjustment method of the settings value from step to step between the points...I mean don't have large and very different values between close points...for example 50% Gray -10R 0G 5B and 55% +10 R 0G 5B....try to fix each error based to the same adjustment logic of nearby steps, to keep the correction values linear from step to step...you can use an excel to write down what values you have set to all points to have a global overview of your settings...and do full pass of all grayscale steps.....check the RGB/Gamma charts...and make the adjustments you believe that will minimize the errors after the end of each grayscale measurement run.
Also sometimes when you do 10/20-Point Grayscale internal display adjustments, to some displays when you change the brightness/contrast setting from it's default settings, this creates a unalign of the calibration controls to the areas they are affecting...for example you can display a 55% pattern, to change RGB balance and your changes to interact to 52% or to 58% Gray etc....not so much to 55% you are displaying/tweaking.
Think a scenario that you are hiring to your living room 5 different pro calibrators to calibrate your display, all of them will use only your meters to calibrate, not their own meters, after the end of each calibrator session, if you write down the menu settings each calibrator used, if you compare at the end these 5 menu setting lists you will see that they are not matching, each one calibrator used different method to calibrate your display.
The same time that the 5 post-calibration reports can be so similar... the image will be slight different... if you swap these 5 memories you will see differences...
This is happening because each calibrator used other method to provide you low dE numbers, If you load some Color Reproduction Patterns, probably you will notice differences in color ramps, clipping bars, color steps etc..
The best of these 5 calibrations settings is the one that the calibrator used with the best way the combination of your internal display controls.
Each available internal calibration control settings that a display has are not always working as expected...Some controls are introducing image anomalies, others have safe working range (for example they are not introducing problems if you use them only at +-2 value of adjustments only), other display controls must not using them, because they are breaking the display color management system or producing non-linearity to display performance, banding, strange artifacts etc.
A calibrator because he sees that kind of problems daily, knows better what to do to provide beyond the dE numbers a better final result visually also, this is something you gain from experience (can't read book/forums/tutorials), you need multiple experience with various displays/tests to gain that experience.