Image map

In HTML and XHTML , an image map is a list of coordinates relating to a specific image, created in order to hyperlink areas of the image to various destinations (as opposed to a normal image link, in which the entire area of the image links to a single destination). For example, a map of the world may have each country hyperlinked to further information about that country. The intention of an image map is to provide an easy way of linking various parts of an image without dividing the image into separate image files.



Kevin Hughes invented the image map while he was a student at Honolulu Community College (HCC).[1]

Definition in HTML

In HTML an imagemap is made of the actual image, that is embedded with the <img>-Tag. The image gets simultaneously the attribute usemap.

The imagemap comprise <map>-Tag and in the detail of the <area>-tags, which defines the fields with the weblinks. These are similar to the <a>-Tag defining which URL should be opened.

Following code defines a rectangular area (9,372,66,397) with a link to the English Wikipedia:

<img src="image.png" alt="alternative text" usemap="#mapname" />
<map name="mapname">
  <area shape="rect" coords="9,372,66,397" href="" />

Image maps use

Dr Johnson - Dictionary writer Boswell - Biographer Sir Joshua Reynolds - Host David Garrick - actor Edmund Burke - statesman Pasqual Paoli - Corsican patriot Charles Burney - music historian Thomas Warton - poet laureate Oliver Goldsmith - writer prob.The Infant Academy 1782 unknown painting An unknown portrait servant - poss. Francis Barber Use button to enlarge or use hyperlinks
Image map example of The Club (Literary Club). Clicking on a person in the picture causes the browser to load the appropriate article.

It is possible to create image maps by hand using a text editor, but doing so requires web designers to know how to code HTML as well as how to enumerate the coordinates of the areas they wish to place over the image. As a result, most image maps coded by hand are simple polygons.

Because creating image maps in a text editor requires much time and effort, many applications have been designed to allow web designers to create image maps quickly and easily, much as they would create shapes in a vector graphics editor. Examples of these applications are Adobe's Dreamweaver or KImageMapEditor (for KDE), and the imagemap plugin found in GIMP.

Image maps which do not make their clickable areas obvious risk subjecting the user to mystery meat navigation. Even when they do, where they lead may not be obvious. This can be partially remedied with rollover effects.[2]

Rollover effects

When designing an image map it is important to indicate to the user that the image is mapped. This may be done by a text instruction accompanying the image (like the one illustrating this page), by an indication within the image itself, or by a rollover effect which will alert the user that different sections of the image will respond differently to their interaction. When using an editor capable of layering images such as Photoshop or GIMP, sections of the image may be cut and pasted in place over a copy of the image which has reduced brightness. These highlighted areas will stand out to the user.

Client-side image maps can be implemented so that the user is given a visual indication of what can be clicked on. This can be an indication of the position of all the hot spots, or can be a rollover indication of the currently active hot spot. This functionality cannot be implemented using pure HTML, but can be implemented when a Clickable image is built using a programming environment such as XHTML with Cascading Style Sheets, ECMAScript and Java.

Rollover effects can be implemented by writing ECMAScript code to swap out the entire image with one that has that particular area highlighted, but this technique can use a considerable amount of bandwidth. Another solution is to script one or more page elements to respond as the mouse moves over the image.

See also


  1. ^ Mary Jo Fahey (1997). Web publisher's design guide for Macintosh. p. 241. 
  2. ^ Flanders, Vincent (March 1998). Web Pages That Suck: Learn Good Design by Looking at Bad Design. San Francisco: Sybex Inc. ISBN 978-0782121872. 

External links

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Image stitching — or photo stitching is the process of combining multiple photographic images with overlapping fields of view to produce a segmented panorama or high resolution image. Commonly performed through the use of computer software, most approaches to… …   Wikipedia

  • Map — For other uses, see Map (disambiguation). A map is a visual representation of an area a symbolic depiction highlighting relationships between elements of that space such as objects, regions, and themes. Many maps are static two dimensional,… …   Wikipedia

  • Map projection — A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy s Geography and using his second map projection A map projection is any method of representing the surface of a sphere or other …   Wikipedia

  • Map of Juan de la Cosa — The New World is shown in green near the top and the Old World in the middle and bottom of the map, in white. The map or chart of Juan de la Cosa is a mappa mundi painted on parchment, 93 cm high and 183 cm wide, currently preserved at the… …   Wikipedia

  • Map–territory relation — The map–territory relation describes the relationship between an object and a representation of that object, as in the relation between a geographical territory and a map of it. Polish American scientist and philosopher Alfred Korzybski remarked… …   Wikipedia

  • Map collection — Not to be confused with atlas or map series. Visscher, Cl.J., World Map. 1652., in Doncker, Hendrick, Sea Atlas (1659 ed.), from the map collection of the National Library of Australia …   Wikipedia

  • Image registration — Registering and summing multiple exposures of the same scene improves signal to noise ratio, allowing to see things previously impossible to see. In this picture, the distant Alps are made visible, although they are tens of kilometers into the… …   Wikipedia

  • Image — This article is about visual artifacts or reproductions. For other uses, see Image (disambiguation). Picture redirects here. For other uses, see Picture (disambiguation). For policy on Wikipedia, see Wikipedia:Images. The top image is captured… …   Wikipedia

  • MAP kinase kinase kinase kinase — Mitogen activated protein kinase kinase kinase kinase (MAP4K) is a family of proteins involved in cellular signal transduction. This list is incomplete; you can help by expanding it. MAP4K1 (aka HPK1) MAP4K2 (aka GCK) MAP4K3 MAP4K4 MAP4K5… …   Wikipedia

  • Linear map — In mathematics, a linear map, linear mapping, linear transformation, or linear operator (in some contexts also called linear function) is a function between two vector spaces that preserves the operations of vector addition and scalar… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.