'Header Image' section missing from 'Appearance -> Customise'

I assume that the above is part of a function called using a hook like after_setup_theme, yes?

Yes it is, I just got too over-eager on my cutting! Will amend.

I do add some of my own customisation settings, although none that use the header_image section, and I when I output $wp_customize I can see that the header_image setting is listed and includes my default image.

It has the parameter [theme_supports] => custom-header, which has obviously been added as I get the page Appearance -> Header.

Thanks.

Could we see the complete function code?

Of course. I also include the action/function to add theme support for custom headers in this file, but I’ve not duplicated it as it is posted in my original question.

Thanks.

/**
 * Add the JS for the live preview
 */
add_action('customize_preview_init', 'customiser_live_preview');
function customiser_live_preview(){
	wp_enqueue_script('theme-customiser', get_template_directory_uri().'/admin/js/customise.js', array( 'jquery','customize-preview' ), '', true);
}

/**
 * Add custom controls to the theme customiser
 */
add_action('customize_register', 'register_costomisation_controls');
function register_costomisation_controls($wp_customize){

	$wp_customize->add_section('footer_section' , array(
		'title'		=> __('Footer', 'dd_theme'),
		'priority'	=> 1010
	));

	$wp_customize->add_setting('footer_background_colour' ,array(
		'default'	=> '#CFCFCF',
		'transport'	=> 'postMessage'
	));
	$wp_customize->add_setting('footer_text' ,array(
		'default'	=> '',
		'transport'	=> 'refresh'
	));

	$wp_customize->add_control(
		new WP_Customize_Color_Control(
			$wp_customize,
			'footer_background_colour',
			array(
				'label'		=> __('Background Colour', 'dd_theme'),
				'section'	=> 'footer_section',
				'settings'	=> 'footer_background_colour'
			)
		)
	);
	$wp_customize->add_control(
		new Customize_Textarea_Control(
			$wp_customize,
			'footer_text',
			array(
				'label'		=> __('Text', 'dd_theme'),
				'section'	=> 'footer_section',
				'settings'	=> 'footer_text'
			)
		)
	);

}

/**
 * Output the relevant styles for customised settings in the header
 */
add_action('wp_head', 'output_costomisation_css');
function output_costomisation_css(){
?>
	<style type="text/css">
		#footer-full-width{
			background-color: <?php echo get_theme_mod('footer_background_colour'); ?>;
		}
	</style>
<?php
}

/**
 * Custom control class for including a textarea in the theme customiser
 */
if(class_exists('WP_Customize_Control')){
class Customize_Textarea_Control extends WP_Customize_Control{

    public $type = 'textarea';

    public function render_content(){
?>
		<label>
			<span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
			<textarea rows="5" style="width:100%;" <?php $this->link(); ?>><?php echo esc_textarea( $this->value() ); ?></textarea>
		</label>
<?php
	}
}
}

I do add some of my own customisation settings

What happens if you remove these and pare everything down to the absolute minimum?

Ah, never mind, I’ve just figured it out completely by accident!

It seems that you must have uploaded at least one image via Appearance -> Headers for the section to appear in Appearance -> Customise. As I was using a default from my theme and had no uploaded images, the section was hidden.

Thanks for you time though, help is always appreciated.