The hyperlink or picture column is used to display an image or provide a link. Used by picture libraries, links lists, and promoted links lists. Caveat for using the picture field is that the pictures must already be uploaded somewhere. It’s not a spot where you can upload an image to have it attached to a new list item. This means that there must be an asset or picture library present for these images to exist.
Use this column field type to store a hyperlink to a Web page or to display a graphic on the intranet or Internet.
A Hyperlink or Picture column stores the Uniform Resource Locator (URL) for a Web page, graphic, or other resource. Depending on the display format that you choose, it displays either a hyperlink that can be clicked to access the resource, or a graphic instead of the URL for the graphics file.
To display the URL as a hyperlink, select the Hyperlink format. When people enter information about an item, they can enter the URL and descriptive text that appears in the column, instead of the URL. To display a graphic, instead of the URL for the graphics file, select the Picture format. When people enter information about an item they must enter the complete URL for the graphics file, such as http://www.example.com/image.gif, and they can optionally enter descriptive, alternative text for the graphic, which appears for people who turn off graphics in their browsers or rely on screen-reading software to convert graphics on the screen to spoken words.