Getting image url from globals asset field

Question

I can retrieve only the image title from the below code, I can't see why the image URL is showing as empty? its a global handle 'brand' and asset field 'logo':

{% set image = brand.logo.one %}

<a href="/">
    <img class="logo" src="{{ image.getUrl() }} alt="{{ image.title }}">
</a>    

Answer 1

Thanks to Andrew Fairlie for pointing out I need to make sure Assets in this volume have public URLs set