I have a wordpress users that aren't very good at resizing images so when they upload an image to wordpress it's still big > 3000px.
They can import into a post and a thumbnail is generated. When you click on the thumbnail the image appears in a light box (using fancybox) but because the image is so big it takes ages to load.
Is it possible to open a smaller version of the image (say 800px wide) in the lightbox? Automatically, without the user having to resize the image before uploading?
Is there a plugin for this?