Web directories - or human-made lists of links - offer another way of locating images on the Internet. Directories provide links to whole resources and will rarely point you to particular images. General Directories include the Yahoo Directory and the Open Directory Project. Included here are a few directories that specialize in image resources.
Image databases available online often contain high quality images that are invisible to web crawlers.
You can use search engines and directories to locate these databases. Some examples are: