Switching Images to HTTPS

Some images on a website that has an SSL certificate are still displaying as http instead of https, thus causing those webpages to display as 'not secure' by Google.

Is there an easy way to switch over all images on a site like this so that they are https instead?

If they are click thru and not files on your site, just make sure the url has the s in it. If they still come up insecure of won't display at all, the problem is where the pictures are located, can't do much about that I am afraid. 

I'd love to know if this is ever fixed.