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<?php
function silencio_content_image_sizes_attr($sizes, $size) {
    $width = $size[0];
    if (get_page_template_slug() === 'template-full_width.php') {
        if ($width > 910) {
            return '(max-width: 768px) 92vw, (max-width: 992px) 690px, (max-width: 1200px) 910px, 1110px';
        }
    }
    if ($width > 597) {
        return '(max-width: 768px) 92vw, (max-width: 992px) 450px, (max-width: 1200px) 597px, 730px';
    }
}
add_filter('wp_calculate_image_sizes', 'silencio_content_image_sizes_attr', 10 , 2);
?>