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// Add Feature Image size, hard crop

if ( function_exists( 'add_image_size' ) ) {

     add_image_size( 'feature-image', 570, 285, true );

     add_image_size( 'feature-image-small', 285, 285, true);

     add_image_size( 'feature-image-home', 285, 303, true);

}



// To use the image, if feature image exist

if ( has_post_thumbnail() ) { the_post_thumbnail( 'feature-image' ); }



// Add a class to the image

echo the_post_thumbnail( 'feature-image-large', array('class' => 'feature-image') );