{{ $sourcePath := "images" }}
{{ $gallery := site.GetPage $sourcePath }}
{{ with $gallery.Resources.ByType "image" }}
{{ $index := len . }}
{{ $.Scratch.Add "img" slice }}
{{ range . }}
{{ $index = sub $index 1}}
{{ $.Scratch.Add "img" (dict "index" (string $index) "url" (string .RelPermalink) "imgH" (string .Height) "imgW" (string .Width)) }}
{{ end }}
{{ end }}