Tor N. Johnson

<p>The traditional wordpress image resizing engine will resize images to fit within the specified size but not preserve the destination pixel dimensions OR will crop the image. This plugin gives a third alternative – the image will be reduced to fit within the specified size and then the canvas extended to preserve the destination pixel dimensions. The canvas will then be filled in based on a sampling of the colors in the four corners of the image.</p>
<h3>Requirements</h3>
<p>This plugin requires that either ImageMagick or GD be installed on the server.</p>


TileCrop

Extends the resize/crop function to allow images to be matted and enforce aspect ratios.

Orangelab

Rickard Westerlind

<p>Dramatically improve the quality of re-sized images by making WordPress use ImageMagick instead of standard GD image library.</p>
<p>Features</p>
<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>
<p>Lnguages: English, French, German, Swedish, Turkish</p>
<p>Requires either ImageMagick binary or Imagick PHP module.</p>
<h3>Contribute</h3>
<p>Code repo available on https://github.com/orangelabweb/imagemagick-engine/</p>


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.

TileCrop vs ImageMagick Engine