I read a bunch of posts about people sounding very smart about it, but all they do is showing how to activate soft-proof and other self-explanatory things. What I can’t figure out is how to actually adjust the soft-proof image to match the original. In the Krita manual it says, one can use the "new view " to have a side-by-side view of the original and the softProof version so we can adjust the latter. But first of all, when I adjust the colors of soft-proved view, it also alters the original view. So how can I compare?
The second issue is that, the soft proof appears to washed out with no blacks ( I assume this is normal ) But when I try to crush the blacks, it won’t go below a certain level and I can’t get my blacks back.
Am I overthink things here?
Hello @Pirateof-KritaArtist, and welcome to the forum!
I’m not the color guru, I paint by feel myself rather than by rules and does and don’t’s. But to help you a first step further, it should be enough. 
To see better results on the softproofing view, you should change the color space used by the color selector in Krita, namely via ‘‘Settings’’ >> ‘‘Configure Krita’’ >> ‘‘Color Selector Settings’’ in the first tab >> ‘‘Color Selector’’ use the setting ‘‘Color Selector Uses Different Color Space than Image’’ to set there the color space you want to view via softproofing and have output at the end. This is to avoid the deviating appearance. The deviations you mentioned are caused by the fact that you are currently selecting colors whose values are sometimes partially outside the display range of your output color space, which you avoid with this setting.
However, further color science must be done by more knowledgeable users, I am the wrong contact person.
Michelist
Add/Edit: Hello @sooz! 
Edited: twice
I went into the manual to find the page you’re looking at. Is it this page?
https://docs.krita.org/en/user_manual/soft_proofing.html
Nowhere on this page is “new view” recommended (for exactly the reason you stated - both instances will be changed simultaneously).
If I wanted to use softproofing to match the values in an original piece, I’d export my finished artwork as a png and open that png as a second document on the screen (the first document being the .kra file in softproofing mode). That is how you can view the document side by side while softproofing. You can do this as long as you have multiple document mode set on subwindows and not tabs (Settings > Configure Krita > General > Window).
Did that answer your question about how to edit in softproofing while viewing the original?
Please know that we’re all volunteers here. You may not have intended it but your topic title and first phrase come off as quite snarky. You’re welcome here and we’ll keep helping you but please treat this forum as a good place to build relationships and learn (and help others).
(EDIT: Waving back, @Michelist)
Softproofing is just enabling a preview of the current image in other colour profile. The amount of colours in that colour profile determines how the image looks. While your original image still there softproofing will not alter your original colours it is justa preview like a temporary filter applied on top of your image to give you a sense of how the image will look if you decide to convert the image in the target colour profile. The taget colour profile may have less colours for example cmyk profiles have less colours than the RGB ones. so if there is a floroscent blue or some other colour which is not available in CMYK it will be shown with the nearest matching colour. And that can be quiet a big difference some times bright blue can be a dull one bright pink can be just orangish red etc etc. It gives you a preview of how the colour will look so that you can adjust it to satisfactory level, but it can’t be 100% matching because there will be no exact colours in the colour profiles in this scenario.
For your example of black can you show a screenshot and or which colour profile you are using for the document and which colour profile is given as the softproofing target?
First of all, I apologize if my post came off snarky 
. However , I was referring to the posts outside this forum. I have to point out that I am an instructor myself and I just can’t understand why people post incomplete and sometimes confusion articles.
Krita -manual:
“You can toggle soft proofing on any image using the CTRL-Y shortcut. Unlike other programs, this is per-view, so that you can look at your image non-proofed and proofed, side by side. “
I misunderstood this I guess.
Now, unfortunately all of the answers here didn’t solve my issue.
Right now I am using the default soft-proof settings. whatever I do, I can’t get my blacks back.
Now the interesting thing is that in affinity photo I can. So now I am wondering what’s going on.
@Pirateof-KritaArtist What colour model and profile are you softproofing to and why?
What does this mean?
Can you provide an explanation of what you’re doing and what happens, with example images.
And those are … what?
Can you tell us which color space/color profile is current document?
Also a full screenshot of your Krita could help
Grum999
I think you misunderstood the manual. In Krita, all views of the same document that were created using Window → New View are the same document. Which means, the pixel data is the same. You can turn on soft proofing in one of them, but if you then change pixels on it, both views will change because you changed the data.
If you want to convert to that other color space and change the colors of the result, you can just convert it and change the colors (I do recommend saving as .kra beforehand to keep a backup, then flatten the image, and only then convert, because color space affects blending of the layers).
Soft proofing is a way to avoid destructive converting the colors and just look at the result in the middle of painting. If some color is off in the soft proofing view, you can edit it in the main view. (You can also press Ctrl+Y twice to just see the result and come back to non-soft-proofed view).
So if, for example, a color looks orangeish on soft-proofing view, you can edit the original pink to be colder/bluer, which could improve the situation in the soft-proofing view. And thanks to soft-proofing, you can make your dream picture in RGB using the whole range but pick colors that look good when printed out, too (slightly colder pink should still look good and pinkish in RGB even though it’s different from your originally picked color). If you used CMYK from the beginning, or if you converted to CMYK in the middle of work, you’d have to deal with uglier blending and restricted color range, which means after finishing your work, the PNG file would look muddier than if you worked in RGB and used soft-proofing just to correct the worst offenders.
That’d probably because you’re using a wrong CMYK profile. Krita cannot ship certain very common CMYK profiles like SWOP and FOGRA, and the only one Krita provides is “Chemical Proof”, which is open source but has a specific purpose which is usually not what users want. One of its characteristics is a very greyish black. If you want to use soft-proofing correctly, you gotta use the CMYK profile that you will be using when printing (so, FOGRA or SWOP, most probably. You can download it on the internet for free, and there is a chance you already has it available on your PC; Krita should show it in the color profiles drop-down if it’s installed on your system).