I found a “tool item” but where can i find the tools to sharpen images and pdf’s?
Just double-click on an image view.
Hmm… i feel a bit stupid here, if i double click on an image i just get it in a new window… No tools there.
Double click on the view displaying the image (e.g. in split/three-pane views or in image windows).
You have to double-click on the image-view itself, to open the image editor. That’s not the same as double-clicking on the image’s name in a list. 
Found it, thanks! 
Found it, thanks!