How to change HSV value without changing saturation?

This is a fully saturated red.

After changing its value, it becomes less saturated.

This is not what I expected. I’d like to change its value and value only. I expected it to be this color:

The same goes with “Value” layer blending mode. How could I change value only?

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I don’t know why the HSV filter behaves like that.

If you edit the foreground colour by clicking on the Toolbar FG/BG icon, that colour selector has HSV percentage adjustment, which may be useful for you.

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Thank you. It’s good to know, but I’d like to do it non-desctructively. I’m not choosing the foreground color, but modifying existing pixels.

On this point, I have asked before:
Questions of HSX blending mode - Develop / Artists Feedback & Testing - Krita Artists (krita-artists.org)

I feel it should be considered a bug. HSV blend mode should change things according HSV model… no?

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