There are two solutions - depending on your needs:
For single images, you could insert a bookmark above the image, and add a cross-reference pointing to that bookmark. In the resulting PDF, the crossref jumps to the image. Of course, this isn't viable if there are a lot of pics to cross-ref (you may use a macro for this kind of task).
Instead of cross references, use hyperlinks. While cross references can't address objects like images directly and need a caption as target, hyperlinks may point to images directly.
- Pro: no need to put additional bookmarks near your images.
- Con: You can't automatically use the target page number or caption as hyperlink text.
To insert a hyperlink to an image: Make sure to select "Document" at the left of the insert Hyperlink dialogue (1), then click the button at the right of the "Target" text field (2). A list of target categories appears, allowing to select the appropriate image:
