how to use Custom Header Option

I am using a Theme called “Train” https://wordpress.org/themes/train/
the file named custom-header.php has the code below and I tried changing the width and height but it doesn’t seem to work. I want to change the header to use a taller image, any advice on how to do that is greatly appreciated.

function train_theme_custom_header_setup() {
	add_theme_support( 'custom-header', apply_filters( 'train_theme_custom_header_args', array(

		'default-text-color'     => '#005580',
//		'width'                  => 1320,
//		'height'                 => 90,
'width'                  => 641,
'height'                 => 194,    
//		'flex-height'            => true,
		'flex-height'            => false,

• This topic was modified 9 years, 5 months ago by Rick Cheney.