hugo-academic/layouts/partials/header_image.html

{{ $featured := (.Resources.ByType "image").GetMatch "*featured*" }}
{{ with $featured }}
{{ $image := .Fill "1600x400" }}
<div class="article-header">
  <img src="{{ $image.RelPermalink }}" class="article-banner" itemprop="image" style="width: 100%; min-height: 400px; height: auto;">
  {{ with $.Params.header.caption }}<span class="article-header-caption">{{ . | markdownify | emojify }}</span>{{ end }}
</div>
{{end}}

{{ if and .Params.header.image (not $featured) }}
<div class="article-header">
  {{ $img_src := urls.Parse .Params.header.image }}
  {{ if $img_src.Scheme }}
    <img src="{{ .Params.header.image }}" class="article-banner" itemprop="image">
  {{ else }}
    <img src="{{ (printf "/img/%s" .Params.header.image) | relURL }}" class="article-banner" itemprop="image">
  {{ end }}

  {{ with .Params.header.caption }}<span class="article-header-caption">{{ . | markdownify | emojify }}</span>{{ end }}
</div>
{{end}}