<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
On 10/25/2023 7:46 AM, krishna Ayyala via QGIS-User wrote:
<blockquote type="cite">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div><font color="#0000ff">Thanks for the reply Simon. The
Polygonize tool did not work for me.</font></div>
<div><font color="#0000ff"><br>
</font></div>
<div><font color="#0000ff">Regards.</font></div>
<br>
</div>
</blockquote>
It's not surprising that polygonize didn't work. Polygonize
recognizes regions of constant color. The patterned fills of the
regions in your file will completely defeat polygonize. The fact
that regions overlap only further complicates the matter. You will
either have to manually digitize the image or find someone who has
the files that were used to generate the map.<br>
</body>
</html>