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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).

Umar

Logics Fort

<a href="http://www.logicsfort.com/plugins/image-watermark-wp/" rel="nofollow ugc">Image Watermark WP</a> that protects your photos quickly! Image Watermark WP plugin allows you to watermark any of your photos with a variety set of options.
For more information, check out plugin page at <a href="http://www.logicsfort.com/" rel="nofollow ugc">LogicsFort</a>, <a href="https://www.logicsfort.com/docs/image-watermark-wp" rel="nofollow ugc">documentation page</a> or plugin <a href="http://www.logicsfort.com/support/forum/image-watermark-wp/" rel="nofollow ugc">support forum</a>.
<h4>Features include:</h4>
<ul>
<li>Apply watermark option in Media Library actions</li>
<li>Choose the position of watermark image</li>
<li>Upload custom watermark image</li>
<li>Watermark image preview</li>
<li>Set watermark offset</li>
<li>Select post types where watermark will be applied to images or select adding watermark during any image upload</li>
<li>Select from 3 methods of applying watermark size: original, custom or scaled</li>
<li>Set watermark transparency / opacity</li>
<li>Select image format (baseline or progressive)</li>
<li>Set image quality</li>
<li>Protect your images from copying via drag&drop</li>
<li>Gets the job done without tweaking.</li>
<li>Easy to learn and use</li>
</ul>

Image Watermark WP

This is Awesome Plugin For Watermark in WordPress, no one can beat the features. Many thanks for developer



Awsome Plugin For Watermark

Is the only watermark plugin which works out of the box for me. i needed a solution for just certain posttypes. and this even works with s3 offload lite plugin. nice!



works out of the box

Image Watermark WP that protects your photos quickly!

Header Watermark vs Image Watermark WP