Images: Is image indexed if it is not on the page?

[NickMNS]

Will Google index an image if the image does not appear on a page?

Let me explain (this scenario is purely hypothetical):
Case 1 (typical): You have a page and you display an image on the page, that image will most likely appear in image search.
Case 2 (typical): You have a page and you display a thumbnail of an image on the page and link to an image file, that image will most likely appear in image search.
Case 3 (case in point): You have a page and you display a link with some anchor text eg: "see image" on the page and link to an image file, will that image be indexed by Google?

[keyplyr]

Will Google index an image if the image does not appear on a page?

Not in my experience. The image must display as page content somewhere.

So...
Case 1 = yes
Case 2 = yes
Case 3 = no, unless the image displays somewhere else, e.g. some scraper grabbed it and displays it at another resource.

I wanted several images to be included in Google & Bing's image search but they were not relevant to any page content of mine so I displayed them at Pinterest & they eventually were indexed in image search. Google+ is another.

How you tag them & surrounding text is important.

[NickMNS]

This is what I thought as well, but wanted to hear it from others, just to be sure.