Google Image search by URL - "Find more like this one" button
I have a gallery of images on my website. Under each one, I'd like to have a link that says "Find more like this one". This link would automatically give Google Image Search the image url and return to the user a google search gallery of images like the one they clicked.
To know what I mean by Google Image search by URL, go here and click the camera icon: http://images.google.com/
I haven't really found anything in the deprecated API, and I looked at the way google does it itself, and it seems the submit button is intercepted by obfuscated javascript (even though the form html is of the GET request format).
So I'm at a bit of a loss, not sure if this is even possible.
Answer
This is what you need: http://images.google.com/searchbyimage?image_url=
followed by the URL to each of your images on your gallery.
Example: http://images.google.com/searchbyimage?image_url=http://www.google.com/images/srpr/logo3w.png
I came across your question after suffering a similar problem. I don't have a gallery, I just dislike sharing my browser/computer/personal identity with Google, thus I use Noscript.
When searching for the URL of an image (without clicking the JS obfuscated button), above the results, says thus: "For matching images, try search by image"
and "Search by image" is a clicky link.
Hope this helps you.