Hello all, ty for your answers.
@Eggy: Yes, this is what I want.
Attached you can find a Little Illustration of what I mean. So basically imagine you have a photo in your Hand (printout). Imagine you would like to have the exact same photo, but smaller, in Terms of relative size. E.g. 50% smaller, and also as a printout. This is what I would like to achieve in photoshop.
So if I reduce the Image size, the Image doesnt actually get smaller in Terms of space. At least not, if I look at the Image with ironfanview before and after the Change. Ironfanview is a simple Freeware program to view Pictures. You could use anything for that purpose. The Image in my given example would still be 3 x 3, but more blurry (which makes sense, when I reduce the Resolution, but not the space taken).
I hope that makes it more clear.
@john: Maybe part of what you wrote is correct, I would have to check, But later on you are talking about a 3 x 3 final Image again, which is not what I want. Sorry if my Explanation was not clear enough,
Best,
Tom