How to add cropped custom header image?

Question

I don't see in my custom theme any option for uploading the header image (although there is a code for it in the header)
Do I need to register it somehow?

Also, I have a specific size I want to implement, is it possible to hard-crop the header image on upload? (I want it to be cropped, not resized with CSS)

Solution I found:

I used custom_header_support

$custom_header_support = array(
    'width' => 260,
    'height' => 300,
    'header-text' => false,
);

add_theme_support( 'custom-header', $custom_header_support );

Answer 1

I think you can do that by adding the function add_image_size in your functions.php file of the theme folder.

Read more on how to add add_image_size here: http://codex.wordpress.org/Function_Reference/add_image_size