custom_header.php

<?php
/**
* @uses add_custom_image_header() To add support for a custom header.
* @uses register_default_headers() To register the default custom header images provided with the theme.
*
* @since 3.0.0
*/

// Your changeable header business starts here
define( 'HEADER_TEXTCOLOR', '' );
// No CSS, just IMG call. The %s is a placeholder for the theme template directory URI.
define( 'HEADER_IMAGE', '%s/images/header-image.png' );

// The height and width of your custom header. You can hook into the theme's own filters to change these values.
// Add a filter to yourtheme_header_image_width and yourtheme_header_image_height to change these values.
define( 'HEADER_IMAGE_WIDTH', apply_filters( 'basic_header_image_width',  $lw_top_header_image_width ) );
define( 'HEADER_IMAGE_HEIGHT', apply_filters( 'basic_header_image_height', $lw_top_header_image_height ) );

// Don't support text inside the header image.
define( 'NO_HEADER_TEXT', true );

// Add a way for the custom header to be styled in the admin panel that controls
// custom headers. See yourtheme_admin_header_style(), below.
add_custom_image_header( '', 'basic_admin_header_style' );

// … and thus ends the changeable header business.

if ( ! function_exists( 'basic_admin_header_style' ) ) :
/**
* Styles the header image displayed on the Appearance > Header admin panel.
*
* Referenced via add_custom_image_header() in yourtheme_setup().
*
* @since 3.0.0
*/
function basic_admin_header_style() {
?>
<style type="text/css">
#headimg {
height: <?php echo HEADER_IMAGE_HEIGHT; ?>px;
width: <?php echo HEADER_IMAGE_WIDTH; ?>px;
}
#headimg h1, #headimg #desc {
display: none;
}
</style>
<?php
}
endif;
?>