Originally Posted by Valloric
You can put anything between the heading tags to make Sigil link to it in the NCX, and set the "title" attribute on the <h#> element to get the text.
So, "<h1 title='Chapter 1'><img ... ></h1>". The TOC would link to that heading element (and by extension, the images inside it) and the TOC entry would say "Chapter 1".
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