Enrico Sorcinelli

Feature Image Extended extends featured image functionality allowing:
<ul>
<li>Hiding featured image in your themes for all post types.</li>
<li>Adding link to the featured image.</li>
<li>Adding thumbnail featured image in administration screens listing.</li>
<li>Featured image quick-editing.</li>
</ul>
<h3>Usage</h3>
Once the plugin is installed you can control settings in the following ways:
<ul>
<li>Programmatically by using <code>featured_image_extended_settings</code> filter (see below).</li>
<li>Using the Settings->Featured Image Extended administration screen.</li>
</ul>
If your theme uses a different call other than <code>the_post_thumbnail()</code>/<code>get_the_post_thumbnail()</code> in order to get the featured image, this plugin might not work. 
So, in order to get extended featured image settings and apply to your pages, you should use <code>featured_image_extended()</code> (see below).
<h3>API</h3>
<code>featured_image_extended( integer $post_id = null )</code>
It returns an array containing featured image extended information of <code>$post_id</code> post (or current post if you don’t supply an argument) like following:
<pre><code>array(
 'show' => true,
 'url' => 'https://myurl.com',
 'target' => '_blank',
 'title' => 'Image title',
)
</code></pre>
<h4>Hooks</h4>
<code>featured_image_extended_settings</code>
Filter plugin settings values.
<pre><code>apply_filters( 'featured_image_extended_settings', array $settings )
</code></pre>
<code>featured_image_extended_admin_settings</code>
Filter allowing to display or not the plugin settings page in the administration.
<pre><code>apply_filters( 'featured_image_extended_admin_settings', boolean $display )
</code></pre>

Featured Image Extended

Feature Image Extended extends featured image builtin functionality.

cubecolour

Add the [zoom] shortcode to a page, post or custom post-type post. If the post has a featured image it will displayed on the page, and when you move the cursor over the image, the image will be magnified with the image viewport remains constrained to the dimensions of the original image.
on a mobile/touch device the image will also be zoomable, but as there is no hover state this is achieved by means of a pinch & zoom action.
On my site you can see a <a href="https://cubecolour.co.uk/featured-image-zoom/" title="demo of Featured Image Zoom" rel="nofollow ugc">demo</a> of the plugin.
<h4>Usage:</h4>
Ensure that your post/page has a featured image defined.
Use a [zoom] shortcode to your page.
Some optional shortcode parameters can also be used.
=size= 
The large image is used by default for the unzoomed image. Use the size parameter to use a different defined image size.
eg ‘[zoom size=thumbnail]’
=zoomsize= 
The full image is used for the zoomed overlay. This can be changed using the zoomsize shortcode parameter.
eg ‘[zoom zoomsize=large]’
The image size definitions used for the the unzoomed and zoomed images should have the same aspect ratio and cropping.
=zoomin= 
This can be used to tweak the level of zoom. The value must be a positive integer. The default is 6 so if the zoom level results in too much magnification on hover, try a lower value.
eg ‘[zoom zoomin=2]’

Featured Image Zoom

Add a [zoom] shortcode to display a zoomable featured image.

Featured Image Extended vs Featured Image Zoom