Select Transform Feature with Asset Field
Asset fields require a transform to be set manually in the template or can be Created in the dashboard and the transform name used in the template.

{% set thumb = {
    mode: 'crop',
    width: 100,
    height: 100,
    quality: 75,
    position: 'top-center'
} %}

&lt;img src="{{ asset.getUrl(thumb) }}"&gt;