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Screen or a device calibration (scanner printer projector) is a more complex task than the calibration itself, and it is impossible in a video to offer a good solution.

But I agree with the approach and also with the advice on the product mainly for ambient lighting and color adjustment.

Problems in calibration are the eyes the gamut of the various screens or device or material or coating and of course everything changes on destination, web, offset printing, inkjet, papers, video tv, cinema and also marketing has caused serious issues.

As said our eyes are into variable because we compensate for everything so even without calibration in most cases we can see a correct image if the software has color management. That's why most ppl don't feel calibration as must, but it is, it tells us to see images correctly.

I said mkt created serious issues. To have a better contrast they put a polarized glass in front of the screen and everyone here knows that kind of filter works differently with light direction, so even calibrated you'll see a different contrast based on your position.

Again with contrast, for ppl who works with paper the max contrast of the best paper is lower than 400:1 new eizo's have 1500:1

And so on, but one thing is true, you cannot match 2 different screens, gamuts are different contrast are different, sharpening etc.

So this world is very complex, but having a colorimeter is a good start.