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Header Watermark provides you with extra flexibility and control over the header image(s) for your WordPress site:
<ul>
<li>Use any image from your Media Library as a watermark for your header image(s)</li>
<li>Control the placement and opacity of the watermark</li>
<li>Select any suitable image from your Media Library as your header image(s)</li>
<li>Control which images are used for random header images</li>
</ul>
<h3>Requirements</h3>
Header Watermark requires the following to work:
<ul>
<li>GD Library PHP extension – version 2.0.28 or higher</li>
<li>The WordPress theme must use the get_header_image() function to generate the header image and must also define the HEADER_IMAGE_WIDTH and HEADER_IMAGE_HEIGHT constants</li>
</ul>
<h3>Themes</h3>
This plugin works with the Twenty Ten theme with no further configuration.
If you use this plugin with the Twenty Eleven theme, you may see a notice at the top of your website/WordPress admin pages like this:
<blockquote>
Notice: Constant HEADER_IMAGE already defined in /var/www/yoursite/wordpress/wp-content/themes/twentyeleven/functions.php on line 118
</blockquote>
You may also find that you get occasional errors on some WordPress admin pages, for example if you activate a different theme.
To prevent the notice and errors, find and change the following line in the functions.php file of the Twenty Eleven theme:
Change this: 
 define( ‘HEADER_IMAGE’, ” ); 
to this: 
 if ( ! defined( ‘HEADER_IMAGE’ ) ) { 
 define( ‘HEADER_IMAGE’, ” ); 
 }
Any other themes that define the HEADER_IMAGE constant may have the same problems and need to be altered in the same way for the plugin to work.

Header Watermark

Add a watermark image to your WordPress header image and use suitable images from your media library as the header image(s).

8MediaCentral

Watermark WP Image Protect allows you to watermark all the images on your site. Unlike other watermarking techniques and plugins, the original images are unaffected and you do not need to edit or re-upload the images, it is done automatically for you on-the-fly.
Out of the box WP Image Protect has all these capabilities:
<ul>
<li>Apply text watermarks to all of your site in seconds (new and existing uploads) </li>
<li>Set the text, font, colour, size and background of the Watermark</li>
<li>Specify threshold to apply watermarks (to exclude thumbnails as required)</li>
<li>Exclude individual images from Watermarking with the media library</li>
<li>Alter, reposition or remove all Watermarks in seconds through your WordPress administration panel</li>
<li>View Image Statistics (goto Media > Library)</li>
</ul>
Please raise any support queries on the support forum.
<a href="http://8mediacentral.com/developments/wp-image-protect-watermark-wordpress-images-plugin/" rel="nofollow ugc">Add the WP Image Protect Premium Pack</a> for even more powerful features such as:
<ul>
<li>Images as Watermarks</li>
<li>Watermark Transparency</li>
<li>Hotlink Prevention</li>
<li>Supercharged Performance</li>
<li>Variable Text Watermarks</li>
<li>Additional Fonts</li>
<li>Premium Support</li>
</ul>
Video Demonstration
A short video showing how to get started with Watermark WP Image Protect:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/ElAJo-ojvIc?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Some of the features included in the premium pack:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/sZcToOC96CE?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Watermark WP Image Protect

Watermark WP Image Protect is an on-the-fly image watermarking plugin for WordPress.

Header Watermark vs Watermark WP Image Protect