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Place snippet in functions.php, edit maximum image size in Admin -> Settings -> Media -> Image Sizes ("Large Size") (Wordpress 3.1)
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function replace_uploaded_image($image_data) { // if there is no large image : return // paths to the uploaded image and the large image $upload_dir = wp_upload_dir(); $uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file']; $large_image_location = $upload_dir['path'] . '/'.$image_data['sizes']['large']['file']; // delete the uploaded image // rename the large image // update image metadata and return them $image_data['width'] = $image_data['sizes']['large']['width']; $image_data['height'] = $image_data['sizes']['large']['height']; return $image_data; } add_filter('wp_generate_attachment_metadata','replace_uploaded_image');
URL: http://www.wprecipes.com/how-to-automatically-use-resized-image-instead-of-originals