Calibration is never in the eye of the user. Our eyes, or our brain, will always make a balance of whites and colors corresponding the ambient light.
To calibrate a screen correctly, you need a sensor (like Spyder and i1) that will measure your screen objectively.
I do that with spyder4pro and its software. Also on a LED-Backlight monitor (Samsung).
What is digital or technically correct and what we like and think is correct are always based on what we think is perfect. I know this from years of Digital Imaging in medical repair, and what I see from professionals and what I know is correct.
Meaning, I can run the perfect calibration on a Radiologist's viewer (10Mega Pixel Monitor), done to the modality and specifications outlined by the manufacture in a dark room with perfect contrast, balance, resolution etc. etc.
My experience of this, is around 95% of the Dr's will say it is not correct and change it. That is why they each have a user profile and set their own image calibrations up and learn how to change them.
You confuse what are eyes can process with what we like and want, and that is always in the user not the device. Most LED TVs and monitors have the same complaint, "it never looks like it did in the store, and the TV/Monitor looks off."
I or you could show the user that its 100% correct with whatever tool you want. But that does not change the fact that it’s the eye of the user.... (Eye meaning the mind of the user not the physical eye) that wants something different.
Factors that can influence this are but not limited to,
- ambient light
- size of screen
- distance from screen
- age of user
- blood pressure
- do they wear glasses
- mental and physical issues with the user
- service being used on the screen (blue ray, games, text reader, etc)
- on and on
Overall what looks good to me, might be crap to you, or someone else. That is why there are never any manufacture settings that claims "perfect calibrations". So while the tool might work it will never overcome the wants and needs of the user.
Lastly, our eyes and brains do not pick up all light there is. Meaning we cannot see infrared light, or gamma etc. That being the case when you flood the eye with blue light (95% of all screens use blue light) it changes the way users perceive the images and add a time component to that can really give us all types of problems like eye strain, sleep issues, headaches on and on.
Remember our eyes are not meant to work in the medium of air; they were made to work underwater, that is why our eyes are incased in a fluid to allow focusing of objects. So all that we see in the medium of air is only as good as we can see now, not ever.