chebum

<a href="http://visualwatermark.com/wp-photo-protect/" rel="nofollow ugc">Photo Protect</a> adds an invisible layer over your post images to protect them from copying. 
Visitors trying to save an image will get a blank image instead of your photo.
Here is why you should download it:
<ul>
<li>Protects your images. 9 out of 10 visitors won’t be able to download and copy your images.</li>
<li>Works in every modern browser. No plugins required!</li>
<li>Has no dependencies. Correctly works with every framework your theme may have jQuery, MooTools, ExtJS, GWT, etc.</li>
<li>Supports responsive themes. Applies protection in a way both theme and protection layer continue to function properly. Even if your visitor resizes her browser.</li>
<li>Works on smartphones.</li>
</ul>

Photo Protect

Adds an invisible layer over your images to protect them from copying.

Rickard Westerlind

Orangelab

Dramatically improve the quality of re-sized images by making WordPress use ImageMagick instead of standard GD image library.
Features
<ul>
<li>Preserve embedded color profile in re-sized image</li>
<li>Automatically recognize custom image sizes</li>
<li>Allow regeneration of existing images (optionally for selected image sizes only)</li>
<li>Configure image quality or use dynamically computed default value</li>
<li>Optimize different image sizes for either quality or size</li>
</ul>
Lnguages: English, French, German, Swedish, Turkish
Requires either ImageMagick binary or Imagick PHP module.
<h3>Contribute</h3>
Code repo available on https://github.com/orangelabweb/imagemagick-engine/

ImageMagick Engine

Maybe even better.  It uses ImageMagick Engine that is installed and allows me to easily regenerate all my images.

Works as advertised

The thumbnail regeneration could be a bit faster though. I have used it for longer than I can remember, at least 5 years.

Simple, functional

Improve the quality of re-sized images by replacing standard GD library with ImageMagick.

Photo Protect vs ImageMagick Engine