Fancybox module is a great module for those who want to open any content in to popup. It is very easy to configure and use. It displays images, Youtube vedios, Google map etc.

Step 1:

Download FancyBox and enable this module.

Download FancyBox Plugin

Go to sites\all\libraries directory and extract it, and give the folder name of it fancybox.

Step 2:

Create a content type for it, or edit existed content type

Go to Manage Display Tab.

Selcect fancyBox from your image field, and save the configuration.

Now go to your page and click on image, you would see something like this.