Need Help With IMAGE in post

So i have this one image in a blog post. It is fairly big, and my theme is uncode.
When you click on an image, you are able to see a bigger version, with Lightbox. However, this image has a lot on it, and even when you click on it, you can’t see the wording.
I need a shortcode, or a plugin, or something, that allows readers to ZOOM in on parts of this image so that they can see and read the whole thing. Either a hover effect, or the ability to Zoom in more than once.
I have been unable to find the right plugin. Right now, i just need the zoomable ability for this one image.
PLease Help! Any suggestions?