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Make sure you're using PHP 5 and the ImageMagick extension installed.

Once the plugin is active, you use the_article_image($size); function, which echoes an img tag for the image and caption associated with that article, at the width defined by the $size parameter. If there is no image, nothing is returned.

Other functions include a get_the_article_img($size) variant, which returns, rather than echoes the img tag. Also, the_article_photo_caption() and get_the_article_photo_caption() which get the caption associated with that article. get_the_article_photo($size) works like get_the_article_img($size) but just returns a URL, rather than an img tag, and the_article_photo($size) returns the URL to the image, or if no image exists, to a placeholder image in the template directory called img/box.png.