But sometimes the graphic is very complex and it's not brett akers escort to recreate it with TikZ commands.
In these cases, I would like to include the graphic file directly, but still be able to layer my annotations over it.
Editing the image to include the annotation is a possibility, but I'd really like to avoid that because the annotations then wouldn't reflect the document's figure style and size, and also because it'd be harder to change them.
Is there a preferred way to include an external image and then layer additional content over it?
tikz pgf - How can/should I include annotated images? - TeX - LaTeX Stack Exchange
A solution that lets me continue to use TikZ for the annotations is preferred, but not required. Here's an example taken from this overlay slides 5 and 6 in the presentation version:.
There is also a hint elsewhere in the manual in It "escapes" out of the current picture back to "normal TeX".