I want to crop the image from below, whose height is too high.As an image whose height is about 2400px, I want to take only its upper part 600px.
2400px
600px
Script Link
You need to do the work in the container, not the image. I forked your fiddle and added a height limit to the article container and overflow: scrollto demonstrate this point. You can use overflow: hiddenit if you really want to crop it.
overflow: scroll
overflow: hidden
http://fiddle.jshell.net/7b01ednx/
with overflow: hidden
http://fiddle.jshell.net/t2wksLa5/