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Hi all,
I'm new user for kde desktop, I used to use gnome, Now I want to try kde and give this beautiful desktop a chance. but I have some problem with it. When I try to print a picture there is no print preview like in shotwell in ubuntu I found it only when I try to print by gimp. also okular don't have paper scale.

What doesn't have print preview? I see that Okular does have a print preview. Do you mean the Gwenview image viewer?
(though I would agree that print preview should be a standard feature for any app providing print capability)

Also what do you mean by "okular doesn't have paper scale"?