Help with color selection for interiors

Hello everyone!
I am facing the agony of choice when it comes to interior colors.
Pinterest as inspiration is full of beautiful color palettes that I like. Unfortunately, most of them are from an American provider. On their website, there is also a nice online tool where you can view all the colors simulated in various rooms, both in artificial and daylight. Of course, it’s only a simulation, but for me it is still infinitely more helpful than the color sample card from the hardware store.
Is there any reasonable way to convey the colors from the American manufacturer to my painter so that he can mix them? On the website, you can find RGB and hex values and LRV, but I don’t think they are suitable for defining the color precisely enough?

In these usual RAL color fan decks you get around here, all the colors are far too bright for me. I’m looking for colors with a very high white content, precisely toned down. I’m not really making progress. Does anyone have a tip?

You could try having color fan decks sent to you from the American manufacturers; they aren’t that big. Or browse around in the nearby English-speaking countries: I am still very much in love with Farrow & Ball, especially for the subtle yet distinctive color palette. You can easily buy them here. If the colors are too expensive for the entire house: you can basically have anything mixed from the card/fan as a reference. Then at least you have the shade, even if not the great pigments.

For photos on the screen, you have three uncertainties: 1. You don’t know how they are displayed 2. You don’t know how they were edited 3. You don’t know with what light they were taken.

Therefore, it is a gamble to request a color code from the manufacturer and compare it with a screen.

Of course, it makes sense to get inspired by pictures.

If you want to be very precise, go to a painter, show and describe to him what you want, have sample areas of 1-2 sqm made, and look at them at different times of the day in the respective rooms.

You can order the color fan, which contains all the colors that a hardware store (I think it was Hornbach for me) can mix for you. It costs a deposit, which you get back when you return it.

I would take a color fan from the SPECIALTY STORE where you also get the colors from. Then you can be sure that their devices can mix these colors as well...

Do it as suggested by hampshire. Everything else is simply guesswork!