Custom Header Image
To configure a custom header image using the Genesis Framework, you can use this snippet:
add_theme_support( 'genesis-custom-header', array(
'width' => 960,
'height' => 100
) );
You may also use the WordPress built-in custom-header, that allows to configure some more things:
add_theme_support( 'custom-header', array(
'width' => 320,
'height' => 65,
'header-selector' => '.site-header .title-area',
'header-text' => false
) );