Cassie's functions.php

<?php


// CHANGE DEFAULT THUMBNAIL SIZE
function twentytwelve_setup() {
	set_post_thumbnail_size( 700, 9999 ); // Unlimited height, soft crop
}
add_action( 'after_setup_theme', '_twentytwelve_setup', 11 );



//Override content width (for photo and video embeds)
$content_width = 700;

function twentytwelve_content_width() {
	if ( is_page_template( 'page-templates/full-width.php' ) || is_attachment() || ! is_active_sidebar( 'sidebar-1' ) ) {
		global $content_width;
		$content_width = 1090;
	}
}

add_action( 'template_redirect', 'twentytwelve_content_width', 11 );


function twentytwelve_custom_header_setup() {
	$header_args = array(
		'width' => 1090,
		'height' => 250
	 );
	add_theme_support( 'custom-header', $header_args );
}
add_action( 'after_setup_theme', 'twentytwelve_custom_header_setup' );
}