gallery/layouts/partials/albums/images.json

{{- $first := true -}}
{{- $filter := images.AutoOrient -}}
{{- $teaser := .Resources.GetMatch "thumbnail.jpg" -}}
{{- range .Resources.ByType "image" -}}
    {{- if not (eq $teaser .) -}}
        {{- if not $first }}, {{ end }}
        {{ $first = false -}}
        {{- with . | images.Filter $filter -}}
            {
                "title": "{{ .Title }}",
                "url": "{{ .RelPermalink }}",
                "width": "{{ .Width }}",
                "height": "{{ .Height }}",
                "thumbnail": "{{ (.Fit "300x200").RelPermalink }}"
            }
        {{- end -}}
    {{- end -}}
    
{{ end -}}