1. Prepare a header image and place in Dspace folder
Ex-header.jpg
ex - cp header.jpg /dspace/webapps/jspui/image
2. Hide Dspace brand heading
Open header-default.jsp file using Terminal. Apply following commands
gedit /dspace/webapps/jspui/layout/header-default.jsp
Replace this portion for header image setting
<div class="container banner">
<div class="row">
<div class="col-md-9 brand">
<h1><fmt:message key="jsp.layout.header-default.brand.heading" /></h1>
<fmt:message key="jsp.layout.header-default.brand.description" />
</div>
<div class="col-md-3"><img class="pull-right" src="<%= request.getContextPath() %>/image/logo.gif" alt="DSpace logo" />
</div>
</div>
</div>
Replace
<main id="content" role="main">
<p align="middle" topmargin="0"><img src="/jspui/image/header.jpg" width=1135"></P>
Save and close the file.