Webpage (tag)

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webpage=<url> denotes the main web page on which a photo is presented.

IMPORTANT: It is NOT the URL for the image itself! So, images may have a src tag but not a webpage tag.

Contents

Wikipedia

For Wikipedia, this is the photo's main page, which includes notes about authorship, licensing, a link to a discussion page, etc. 

webpage=http://en.wikipedia.org/wiki/File:Tower_bridge_London_Twilight_-_November_2006.jpg

Notice that although Wikipedia image webpages end with '.jpg', the URL does not in fact lead to a JPEG image.

Flickr

For Flickr, to help avoid duplicates, this should be the photo's main page, without any extra stuff in the URL about photostream or sets. Thus only the first of these is optimal: 

webpage=http://www.flickr.com/photos/lorp/2716935335/
webpage=http://www.flickr.com/photos/lorp/2716935335/in/photostream/
webpage=http://www.flickr.com/photos/lorp/2716935335/in/set-72157606348863733/

This precaution applies to many other image hosting websites: always aim for the most concise URL.

Other sites with reliable image webpages

Most websites devoted to images devote a page to each image:

Sites with trickier unique webpages

Some websites do not automatically give the shortest URL form. If possible, shorten these to avoid duplicates. For example, from their search interface, you get longer URLs than necessary:

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