voceplatforms

Chris Scott

Adds multiple post thumbnails to a post type. If you’ve ever wanted more than one Featured Image on a post, this plugin is for you.

Multiple Post Thumbnails

Even though this plugin hasn't been updated in a long time, it still works great! So I guess there's just no reason for the developer to have it updated. ;-)
For me this plugin is one of the easiest ways to selectively add a header image. I want it on some pages, but not on others. Using the standard Featured Image function will set it foor all or none, so that's not flexible enough.
One suggestion for an update though:
Now you still need to add the following snippet to your theme's function.php.
if (class_exists('MultiPostThumbnails')) {
    new MultiPostThumbnails(
        array(
            'label' => 'Secondary Image',
            'id' => 'secondary-image',
            'post_type' => 'post'
            'post_type' => 'page'
        )
    );
}
It would be great if the plugin did this automatically. That will also keep the plugin active if you switch themes. 
P.S.
To add the meta box to other post types, just add it to the snippet.
'post_type' => 'event' will add it for Events Manager, for example. ;-)



Still works great!

Adds multiple post thumbnails to a post type. If you've ever wanted more than one Featured Image on a post, this plugin is for you.

Satish Gandham

By default WordPress generates images of all intermediate sizes registered by themes/plugins for every image uploaded, flooding your uploads folder with images you will never be using. 
In most cases you need the images of all dimensions only for the one set as featured image. 
This plugin prevents WordPress from generating thumbnails registered by themes and plugins, and generates them dynamically when required.
<h3>Another important use of this plugin, the main reason why its developed is</h3>
Different themes use different thumbnail sizes. When you switch to a new theme, 
WordPress just gives the image whose size closely matches the size of the thumbnail being called without generating an image with the required dimensions. 
In most cases the best match is the full size image, which adds lot of weight to your page and also makes it look awful. 
There are plugins to rebuild thumbnails, but they do it for every image uploaded and again flooding your uploads folder. 
Also these plugins timeout on a shared server if you have lot of images.
*This only works with sizes registered by add_image_size() function.

Dynamic Thumbnails

If thumbnails are correctly generated, the plugin breaks the rendering of all my archive pages. Too bad.

Breaks archive pages

A simple plugin for theme developers to dynamically generate thumbnails on the fly without having to ask the users to manually regenerate them.

Multiple Post Thumbnails vs Dynamic Thumbnails