Minimum upload size but for post types

Hello!

I use a php code in my functions.php to enforce minimum upload size on images. I like to limit this feature only on a specific post type. Do you know how to do it?

This is the code that limit the upload size of images.

/**
 * Enforce minimum image upload size.
 */
add_filter('wp_handle_upload_prefilter','handle_upload_prefilter');

function handle_upload_prefilter($file) {
        $img=getimagesize($file['tmp_name']);
        $minimum = array('width' => '760', 'height' => '100');
        $width= $img[0];
        $height =$img[1];

        if ($width < $minimum['width'] ){
                return array("error"=>"No subas imágenes chicas! El mínimo es {$minimum['width']}px de ancho. La que subiste tiene $width px.");
        } elseif ($height <  $minimum['height']){
                return array("error"=>"No subas imágenes chicas! El mínimo es {$minimum['height']}px de alto. La que subiste tiene $width px.");
        } else {
                return $file;
        }
}