I have a Wordpress site that has one featured image per post. Often, that image is exactly the same width as the maximum content width for a post, so it displays 1:1. Sometimes however, it's a much larger image.
What I'd really like to achieve is this: when the source image is much larger than can be displayed, I'd like the user to be able to click the post image and have it popup (maybe in a lightbox?) the full resolution copy, which they can then click off when done.
Can anyone help me with this?