I sometimes get this message which surprises me all the more as I don't necessarily see 'an image' on the page in question.
Also, as you know why I mostly use Infix (for feeding into a CAT Tool), do I need to 'reveal' the hidden text before creating the xml file?
If 'yes', I would have a second question to follow
When Infix analyses a page to work out the structure of the text on the page, sometimes it can discover that some of the text is obscured by a vector clipping path. This is not an Image and is just a warning that some of the text on the page may not be visible to the viewer. You do not need to 'reveal' the hidden text before creating the xml file, all text in the page will be exported whether it is visible or not.