Images from website not showing on Google Images

[PiKe]

I may wish to have google index the pictures on my site, I thought I had been using robots.txt to deny it but this is not the case, the images are parsed through a php script which watermarks them for users that are not logged in in the format www.domain.com/preview.php?id=blah

Could this be the reason they are not being indexed?

 

[PiKe]

Hi PiKe

So you're not rewriting the url to mimic the original images extension? I would say that could quite possibly be the issue.

How would I do that?

 

[PiKe]

Nope.