As per title, I'm searching if there is something similar to OSX's Quick Look or Gnome's Gloobus Preview for KDE: searching Google brought me to some KDE's brainstorms, but nothing more.
Also to Duong Pham website, where he suggest to add a Dolphin sevice menu item installing Gloobus Preview and then create the .desktop file: this is not a solution, because you have to right click and select "preview", rather than just press SPACE.
Any idea?
Preview KDE
Dolphin > Settings > Configure Dolphin > General > Previews.
To preview the KDE need the thumbnailer to be installed:
Few examples:
kde-thumbnailer-audiothumbs
kdegraphics-thumbnailers
kde-thumbnailer-openoffice
ffmpegthumbs
Dolphin > View > Panels > information (F11)
The Information panel will show the preview and the information of the object.
Dolphin > Settings > Configure Dolphin > General > Show tooltips
The tooltip will show the the preview and the information of the object.
The preview plasma widget will show the preview when the image is dropped on the widget.
More
Missing image dimensions in dolphin: http://www.kubuntuforums.net/showthread.php?58122-No-image-dimensions-in-dolphin
KLook
The KDE 4.9 /1/ could have the KLook /2/,/3/. It is something like the Gloobus /4/ but for the KDE.
The KLook is working with the KDE 4.8 /5/.
Advanced preview
There are ways to get auto preview with the KDE file managers /6, 7/ but they are using modified/patched Dolphin/Konqueror.
Links