vrgr (from german "vergrößern", enlargement) makes it more easy to add a colorbox effect to images included in other contents.
In the CKEditor, just add "vrgr" at the class definitions of the image. Thus, clicking on the image in the frontend will show the image in original size in the colorbox.
You can use vrgr on a page as often as needed and it can be combined with other CSS classes for image resizing / positionining.
- colorbox outputfilter or colorbox module (one of this is installed by default)
- the image is resized by CSS, e.g. the snippet is just able to show the same image as added to the content, e.g. with vrgr it's not possible to use image A for the preview and image B for the full view (in this case you need to stick to the manual way of creating a lightbox)