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Last Revised March 17, 2000
YOU ARE HERE> Alchemist's Lair > Web Tutorial > Finding Images
IMPORTANT! This is an archived version of a page which has now been revised with more up-to-date material. It should be used for historical purposes only. The new page is at http://WWW.ONEONTA.EDU/faculty/pencehe/imagesearch.html
An important part of the success of presentation software is the use of appropriate images to reinforce and clarify the lect ure. Many commercial textbooks now include CD-ROMs that provide images that may be used for lectures, but these are not always appropriate. The web is an excellent alternative, since many web pages include images. Unfortunately, it can be a discouraging job to find the desired needle in the midst of the 800 million pages of the WWW haystack. There are, however, several resources that can make this searching easier and more likely to be successful.
When selecting images from the WWW, be sure to take copyright into consideration. Many sites include a statement of copyright policies. Be sure to read these notices before using any images. Some sites copyright all images (even if their right to do so may be questionable); other site owners explicitly state that none of the images are copyrighted and invite educational use.
Sites for General Purpose Images
Often it is possible to use general purpose images from the Web to illustrate
chemical principles and to make the lecture more rea
listic. The Mugar Memorial Library,
one of the Boston University Libraries, has an excellent set of links to
sites dealing with general purpose images. Paula
Berinstein's directory of image sites is also very good. Berinstein
says that her directory of image sites is "not exhaustive," but
it certainly comes close. Another extensive resource is the Digital
Librarian site maintained by Margaret Vail Anderson, a librarian in
Cortland, NY. Finally, the Berkeley Public Library supports the Librarians Index to
the Internet, another searchable listing of image-rich sites.
Special Sites for History of Science Images
The most efficient strategy is to look at sites devoted to science. For example, several web sites are dedicated to pictures of individual scientists. John L. Park, of ChemTeam, runs an on-line gallery of famous chemists.Harry Nelson's site also has pictures of famous scientists (mainly physicists). In addition, Nelson includes excellent links to more image-rich sites.
Another good source of pictures of famous scientists is the Niels Bohr Library of the Center for History of Physics at the American Institute of Physics. The main focus here is twentieth century American physicists and astronomers, but many other images are also included. The Edgar Fahs Smith Memorial Collection at The University of Pennsylvania consists of over 3,000 pictures of scientists, laboratories, and scientific apparatus, and a selection of these images is on the Web.
Image Search Engines
Ditto.com is an excellent searc h engine devoted only to images. This site, formerly called Arribavista, may be searched by key words, and returns thumbnail versions of each image. It currently lists approximately 1.5 million images and is expanding to over 2.5 million images. This search engine can be very effective when looking for general purpose images.
Proteus is a meta search engine for images. The sites that are searchable include AltaVista Photo Finder, The Amazing Picture Machine, The Lycos Image Gallery, and Columbia University's WebSEEk. Besides giving the option of searching eight different on-line collections of images, there is also a good list of links to further image sites that must be searched individually.
The major photo collections searchable by Proteus, can also be searched individually. AltaVista Photo Finder searches 17 million images, audio clips and video files from the web and private collectio ns. The Amazing Picture Machine is operated by The North Central Regional Technology in Education Consortium. The list of the types of pictures available does not include many specific science categories, but this site is sometimes useful. The Lycos Image Gallery, provides two options; search through more than 80,000 free images, current pictures and vintage illustrations on the Lycos Image Collection or search t he entire web.
Columbia University's Webseek does not appear to have many scientific images. The American Memory site is a good place to look for historical U.S. Images. This web site allows a search of the Library of Congress Historical Collections, which includes a technology and applied sciences section.
General Search Engines
Most of the popular search engines allow the bas ic search to be modified by requiring that an image be present. Unfortunately,this is not always adequate. Some engines, like AltaVista, list only images and even give a thumbnail copy, but some other engines will list any page that has the keyword requested and any type of image, including banners, logos, etc. Often the latter approach does not limit the search sufficiently. Searching for the word for chemistry with the image option on, the result may be pages about chemistry that have images, but the imag es may not be very chemical. This is why the search engines that have gathered a searchable list of specific images are often a better bet for finding something useful.
Another way to find chemical images on web pages is to use field searching. Every Web page includes field information, which specifies date, title, type of page (i.e., image, video, audio, etc) etc.Limiting the search to a specific field can narrow the focus and eliminate many useless pages. For example, to se arch for images of robins, enter the following:
i.e. (field type): keyword
Of course, many robin images may have names like bird and so may not be found in this way. Field searching is usually the last recourse, but sometimes it is the only way to get the image that is needed.
Field searching can help to avoid copyright problems if the web images
are found on U.S. Government sites. GovBot
will search only these sit
es. This engine, supported by The Center for Intelligent
Information Retrieval (NSF sponsored), searches a database of over one million
U.S. Government and military pages. Field searching is a little more complicated
here (Be Sure to Read the Hints Link!), but it is possible to select images
from this impressive collection. Unfortunately, this site does not provide
thumbnail images for previewing.
Other Potentially Helpful Sites
As the name implies, Free G raphics offers links to "the top 508 graphic links on the Internet!" that may be used without charge. There is not much chemistry here, but the site is a good source of buttons, bullets, etc. It is another way to avoid copyright problems. Create Your Own Graphics can be helpful when designing banners, buttons, etc. for a web page.
The TechSmith site lists several types of sharew are software that may be of interest, including a program called Snagit. According to the description, Snagit "captures anything on the Windows desktop quickly and easily." A screen capture toollike this can be very helpful in some situations.
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