you can do this by using any of the below modules :
- Image Link Formatter
This module is the result of the discussions around a requested feature
to allow an image field to be displayed with a link to a custom URL
- Image URL Formatter
This module add a url formatter for image field. Then you can output
image url directly.
Most of the code, maybe more than 90%, is just copy from the drupal
core. I think it is stable enough.
I have created a content type, and add an image field instance to it,
later i use views to export the data of this content type.And i want
to output the data,then i could import it into another drupal 7 site
with feeds module. What i need is the url of the image field, but i
could not export the image url directly. That is why i create this
small module.
- Link
The link module can be count to the top 50 modules in Drupal
installations and provides a standard custom content field for links.
With this module links can be added easily to any content types and
profiles and include advanced validating and different ways of storing
internal or external links and URLs. It also supports additional link
text title, site wide tokens for titles and title attributes, target
attributes, css class attribution, static repeating values, input
conversion, and many more.