Stefano Lissa

WordPress themes need thumbnails in different sizes and they even let the user to change those dimensions. 
But WordPress has a problem: it does not regenerates the thumbnails when new sizes are registered.
Thumbnails intercepts the request by themes or plugins to WordPress to get a specific thumbnail, generates it and caches it on disk. 
Efficiently, it produces a perfectly cropped image, with the right dimension avoiding unpleasant stretching.
Thumbnails does not modify your blog or your media library. When deactivated the blog returns to its old behavior.
The second important feature is the autoselection of featured image for post which are missing it. 
You can choose between the on the fly selection without persist it or, for better performances, to persist it once selected.
Read the <a href="https://www.satollo.net/plugins/thumbnails" rel="nofollow ugc">Thumbnails</a> official page for detailed information.
Theme developers can find instructions to use it (no code tied to Thumbnails needs to be written!).
Other plugins by Stefano Lissa:
<ul>
<li><a href="https://www.satollo.net/plugins/hyper-cache" rel="nofollow ugc">Hyper Cache</a></li>
<li><a href="https://www.thenewsletterplugin.com" rel="nofollow ugc">Newsletter</a></li>
<li><a href="https://www.satollo.net/plugins/header-footer" rel="nofollow ugc">Header and Footer</a></li>
<li><a href="https://www.satollo.net/plugins/include-me" rel="nofollow ugc">Include Me</a></li>
<li><a href="https://www.satollo.net/plugins/ads-bbpress" rel="nofollow ugc">Ads for bbPress</a></li>
</ul>
<h3>Screen shots</h3>
No screenshots are available at this time.

Thumbnails

This plugin solves my problems with the WP thumbnails, thanks Stefano!

The one that solves my problem

I re-use my post thumbnail images in various ways, so I like to upload them full size, and I need the software to resize them as needed. This plugin does exactly that for me.

It performs its magic transparently and makes my pages a lot lighter. Highly recommended.


Amazing

Autoselect the featured image and creates pixel perfect resizes on the fly without regenerate all the thumbnails.

kubiq

This plugin is ment mostly for developers. You need to use its functions in your theme or plugin to make it works.
This plugin offers functionality like face detection crop, focal point selector for every image, function to output responsive <picture> sizes and more.
<h3>Why to use this plugin?</h3>
WordPress will automatically create a lot of smaller images for every uploaded image. 
You mostly need just 1 or 2 of them, so this is a waste of your server space and resources. 
Also cropped images are generated from the center by default, which can be a problem many times.
This plugin allows you to:
<ul>
<li>disable autogenerated image sizes</li>
<li>dynamically generate only needed image sizes for only needed images</li>
<li>delete generated image sizes from this plugin individually or all together</li>
<li>specify different focal point that will be in the focus while creating cropped versions of the image</li>
<li>automatically detect focal point by face detection algorithm</li>
<li>disable big image size threshold, so image bigger than 2560x2560px will be NOT scaled down</li>
</ul>
<h3>How it works</h3>
<ol>
<li>if you disable existing autogenerated image sizes, then newly uploaded images will not create its sizes</li>
<li>you need to specify in your code what size is needed for the image</li>
<li>image is dynamically created on the first visit of the page and is stored in <code>uploads</code> folder</li>
<li>every next visit of that page will just load already generated image</li>
</ol>
<h3>Functions</h3>
bis_get_attachment_image_src( $attachment_id, $size, $crop )
Function inspired by default <code>wp_get_attachment_image_src</code>. 
If you used Fly Dynamic Image Resizer before, you don’t need to replace <code>fly_get_attachment_image_src</code> functions in your code – there is a fallback, so you can deactivate Fly Dynamic Image Resizer and it will still work.
Parameters:
<ul>
<li>
attachment_id (integer)(required) 
The ID of the image attachment 
Example: <code>123</code> or <code>get_post_thumbnail_id()</code> or <code>get_field('my_image')</code>
</li>
<li>
size (array)(required) 
An array with the width and height 
Example: <code>[ 1920, 1080 ]</code>
</li>
<li>
crop (boolean/integer/array/string)(optional) 
Skip this or pass <code>false</code> or <code>0</code> if you don’t want to crop, just rescale, 
otherwise pass <code>true</code> or <code>1</code> to use focal point crop that is selected in admin media (by default center), 
or pass array with string x-axis and y-axis parameters like <code>[ 'right', 'bottom' ]</code> 
or pass array with numeric x-axis and y-axis parameters like <code>[ 0.5, 0.8 ]</code> 
or pass string <code>'face'</code> to automatically detect face position (can be exhaustive on server resources)
</li>
</ul>
Returns:
<pre><code>array(
 'src' => (string) url of the image,
 'width' => (integer) width in pixels,
 'height' => (integer) height in pixels
)
</code></pre>
 
bis_get_attachment_image( $attachment_id, $size, $crop, $attr )
Function inspired by default <code>wp_get_attachment_image</code>. 
If you used Fly Dynamic Image Resizer before, you don’t need to replace <code>fly_get_attachment_image</code> functions in your code – there is a fallback, so you can deactivate Fly Dynamic Image Resizer and it will still work.
Parameters:
<ul>
<li>
attachment_id (integer)(required) 
The ID of the image attachment 
Example: <code>123</code> or <code>get_post_thumbnail_id()</code> or <code>get_field('my_image')</code>
</li>
<li>
size (array)(required) 
An array with the width and height 
Example: <code>[ 1920, 1080 ]</code>
</li>
<li>
crop (boolean/integer/array/string)(optional) 
Skip this or pass <code>false</code> or <code>0</code> if you don’t want to crop, just rescale, 
otherwise pass <code>true</code> or <code>1</code> to use focal point crop that is selected in admin media (by default center), 
or pass array with string x-axis and y-axis parameters like <code>[ 'right', 'bottom' ]</code> 
or pass array with numeric x-axis and y-axis parameters like <code>[ 0.5, 0.8 ]</code> 
or pass string <code>'face'</code> to automatically detect face position (can be exhaustive on server resources)
</li>
<li>
attr (array)(optional) 
An array of attributes 
Special attribute <code>retina</code> allows you to automatically generate srcset for <code>@2x</code> retina devices 
Example: <code>array( 'retina' => true, 'alt' => 'Custom alt text', 'class' => 'my-class', 'id' => 'my-id' )</code>
</li>
</ul>
Returns:
<pre><code><img src="https://web.com/wp-content/uploads/bis-images/1234/your-image-500x500-f50_50.jpg" width="500" height="500" alt="Alt text">
</code></pre>
 
bis_get_attachment_picture( $attachment_id, $sizes, $attr )
Parameters:
<ul>
<li>
attachment_id (integer)(required) 
The ID of the image attachment 
Example: <code>123</code> or <code>get_post_thumbnail_id()</code> or <code>get_field('my_image')</code>
</li>
<li>
sizes (array)(required) 
An array with the <code>key => value</code> pair 
where <code>key</code> means breakpoint 
and <code>value</code> is array of width, height, crop and alternative_attachment_id 
Example: <code>[ 767 => [ 767, 400, 1, 987 ], 9999 => [ 1200, 500, 1 ] ]</code> 
This will generate <code><source media="(max-width:767px)" srcset="image987_767x400.jpg"></code> 
and <code><source media="(max-width:9999px)" srcset="image_1200x500.jpg"></code> 
and <code><source media="(min-width:10000px)" srcset="image.jpg"></code> 
If you will provide also key <code>0</code> then it will replace <code><img></code>.
</li>
<li>
attr (array)(optional) 
An array of attributes 
Special attribute <code>retina</code> allows you to automatically generate srcset for <code>@2x</code> retina devices 
Example: <code>array( 'retina' => true, 'alt' => 'Custom alt text', 'class' => 'my-class', 'id' => 'my-id' )</code>
</li>
</ul>
Example: 
To generate perfect fullwidth hero image, that will looks great on 4K devices and also on small phones, but it will load only needed size, you can use:
<pre><code>echo bis_get_attachment_picture(
 get_post_thumbnail_id(),
 [
 375 => [ 375, 500, 1, 987 ],
 575 => [ 575, 500, 1, 987 ],
 767 => [ 767, 500, 1, 987 ],
 991 => [ 991, 500, 1 ],
 1199 => [ 1199, 500, 1 ],
 1399 => [ 1399, 500, 1 ],
 1600 => [ 1600, 500, 1 ],
 1920 => [ 1920, 500, 1 ],
 2560 => [ 2560, 500, 1 ],
 3440 => [ 3440, 500, 1 ],
 3840 => [ 3840, 500, 1 ],
 ]
);
</code></pre>
Returns:
<pre><code><picture>
 <source media="(max-width:375px)" srcset="https://web.com/wp-content/uploads/bis-images/987/your-image-375x500-f50_50.jpg">
 <source media="(max-width:575px)" srcset="https://web.com/wp-content/uploads/bis-images/987/your-image-575x500-f50_50.jpg">
 <source media="(max-width:767px)" srcset="https://web.com/wp-content/uploads/bis-images/987/your-image-767x500-f50_50.jpg">
 <source media="(max-width:991px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-991x500-f50_50.jpg">
 <source media="(max-width:1199px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-1199x500-f50_50.jpg">
 <source media="(max-width:1399px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-1399x500-f50_50.jpg">
 <source media="(max-width:1600px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-1600x500-f50_50.jpg">
 <source media="(max-width:1920px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-1920x500-f50_50.jpg">
 <source media="(max-width:2560px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-2560x500-f50_50.jpg">
 <source media="(max-width:3440px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-3440x500-f50_50.jpg">
 <source media="(max-width:3840px)" srcset="https://web.com/wp-content/uploads/bis-images/123/your-image-3840x500-f50_50.jpg">
 <source media="(min-width:3841px)" srcset="https://web.com/wp-content/uploads/2022/11/your-image.jpg">
 <img width="4000" height="2000" src="https://web.com/wp-content/uploads/2022/11/your-image.jpg" alt="Some alt" loading="lazy">
</picture>
</code></pre>
 
<h3>There is no fallback for <code>fly_add_image_size</code> function</h3>
If you used Fly Dynamic Image Resizer before, you need to remove <code>fly_add_image_size</code> functions from your code. 
You can create your own variables for sizes if you need it, like
<pre><code>define( 'MY_CUSTOM_SIZE', [ 1000, 200 ] );
</code></pre>
and then just us it inside functions, like:
<pre><code>echo bis_get_attachment_image( get_post_thumbnail_id(), MY_CUSTOM_SIZE );
</code></pre>
 
<h3>Support other extensions than JPG, PNG and WEBP</h3>
This plugin works by default only with JPG, PNG and WEBP files, 
but you can easily allow any other mime types, 
just use this code eg. in <code>wp-config.php</code> or in your <code>functions.php</code>
<pre><code>define( 'BIS_ALLOWED_MIME_TYPES', array( 'image/jpeg', 'image/png', 'any_other/mime_type' ) );
</code></pre>
 
<h3>Get selected image focal point</h3>
Focal point data are stored in the attachement post metas. 
There is also custom sanitize function, that you can use.
<pre><code>$focal_point = sanitize_focal_point( get_post_meta( get_post_thumbnail_id(), 'focal_point', true ) );
</code></pre>
Returns:
<pre><code>array( 0.5, 0.8 )
</code></pre>
which means that focal point is 50% from left and 80% from top

Better image sizes

Dynamically generate only needed image sizes for only needed images, with manually selected focal point for crops

Thumbnails vs Better image sizes