Funnnny

A plugin that automatic download and resize your images on Post when it larger than your width and height set on Option page.
This plugin is base on ImageScaler by PaulButler, I only change some code for the better work.

ImageScaler Modded

A plugin that automatic download and resize your images on Post when it larger than your width and height set on Option page.

adamprohack

<h3>What does this plugin do?</h3>
This plugin generate image thumbnails only when site need it, when someone call function with needed size, 
and saves disk space when image is uploaded to media library. 
You don’t need to use <code>add_image_size()</code> function.
<h3>How it works?</h3>
<ol>
<li>Upload image to media library</li>
<li>Change function <code>wp_get_attachment_image_url()</code> to <code>get_otf_image_url()</code> in your wordpress template</li>
<li>When function is invoke the first time, the image is dynamically adjust, create and stored</li>
<li>Page serve image in need size</li>
</ol>
<h3>Documentation</h3>
<pre><code>`php
function get_otf_image_url(
 $image_id, $size_name, 
 $width = 0, $height = 0, 
 $crop_mode = ["center", "center"], 
 $mime_type = "image/jpeg", $quality = 70)
`
</code></pre>
Parameters
<ul>
<li>Required: 
*$image_id – attachment id 
***$size_name** – dynamic size name 
***$width** – image width 
***$height** – image height</li>
<li>Optional 
*$crop_mode – image crop mode 
***$mime_type** – result image mime type 
***$quality** – result image quality</li>
</ul>
Return Value
<ul>
<li>Returns an url string</li>
</ul>

ImageScaler Modded vs WP Images OTF Plugin