Carlos Minatti

Delete Original Image is a WordPress plugin to delete the the original image file uploaded.
The problem that solves, is that the original image file is usually huge (can be >6MB if it is a photograph) and it is never published on the pages, so there is no need to keep it on your server, and it it a must to delete it, if you have limited storage space and you are uploading tons of pictures.
The plugin gives you the option to enable/disable this, to be done automatically when you upload an image.
And/or you can do it in bulk for all your previously uploaded images.
Specifically, this plugin copy the ‘large’ image ( i.e: your-pic-1038×576.jpg ) to the original file path ( i.e.: your-pic.jpg ).
Nothing should brake, all other plugins should keep working, but you need to know that the original image is no longer available on your site, so please do a backup if you think you may need the original images in the future.

Delete Original Image

This plugin allows you to automatically delete the original image after upload, or do it in bulk for old images.

Yudiz Solutions Ltd.

This fabulous plugin has been developed by <a href="http://www.yudiz.com/" rel="nofollow ugc">Yudiz Solutions Ltd.</a> WP Recreate Thumbnails plugin helps you to recreate thumbnails for the uploaded images.
How to use this plugin? 
Follow the below steps: 
1) Install and activate the plugin. 
2) After successful activation of the plugin, you will find one menu item in Left Hand Side in WP Admin named “Recreate Thumbnails”. 
3) Click on that link and then you will find one button named “Recreate Thumbnails”. Click on the button to initialize the process of regenerating thumbnails. 
4) In case you just want to regenerate thumbnail for a single image, then you can do so by going media and that particular image and there you will find “Recreate Thumbnail” button. You just need to click on it and you are good to go.
In case you might have deleted any thumbnail(s) from the uploads folder then this plugin will help you to rescue from such a critical situation and even if you have replaced the image from the uploads folder then it will create related thumbnails.
Hope you find this plugin useful. <a href="http://www.yudiz.com/get-in-touch/" rel="nofollow ugc">Contact us</a> if you want to develop such a custom WordPress plugin.

WP Recreate Thumbnails

This Plugin helps to create thumbnails of uploaded images

Delete Original Image vs WP Recreate Thumbnails