n
        code convention</a>: positive if any system call has returned an error,
      negative (from the <a href="API-datastruct.html#LibRaw_errors">LibRaw
        error list</a>) if there has been an error situation within LibRaw.</p>
    <p><a name="unpack_thumb"></a><a name="unpack_thumb_ex"></a></p>
    <h3>int LibRaw::unpack_thumb(void)</h3>
    <h3>int LibRaw::unpack_thumb_ex(int i)</h3>
    <p></p>
    <p>unpack_thumb(): reads (or unpacks) the default (largest) image preview
      (thumbnail), plac