So I have a robots.txt file which contains:
User-agent: Googlebot-Image
Disallow: /
At most, it stops the indexing of a lot of images. However, I also have affiliate images that when you search come up in results in Google (and assumably other search engines too).
I was wondering if it was possible (I've searched with no results) to add a rel="noindex" to images, or equivalent.
The affiliate images are served through a PHP loop, so I was looking for a one line fix if possible, as well as knowing that I wouldn't have to manually add the code each time :)
Since the images are being served via PHP you can easily tell Google not to index them by sending a HTTP header designed specifically for this purpose.
Just put this line before your image output:
header("X-robots-tag: noindex");