{{- /* Expects .image (resolved image resource), optionally .processes and .filter */}}
{{- $image := .image }}
{{- range .processes }}
  {{- $image = $image.Process . }}
{{- end }}
{{- with .filter }}
  {{- $filters := slice }}
  {{- range . }}
    {{- range $method, $args := . }}
      {{/*  No, this cannot be generalised, as strings cannot be converted to functions...  */}}
      {{- if eq $method "GaussianBlur" }}
        {{- $filters = $filters | append (images.GaussianBlur $args) }}
      {{- else if eq $method "Brightness" }}
        {{- $filters = $filters | append (images.Brightness $args) }}
      {{- else if eq $method "Opacity" }}
        {{- $filters = $filters | append (images.Opacity $args) }}
      {{- else if eq $method "Pixelate" }}
        {{- $filters = $filters | append (images.Pixelate $args) }}
      {{- else if eq $method "Saturation" }}
        {{- $filters = $filters | append (images.Saturation $args) }}
      {{- else if eq $method "Sepia" }}
        {{- $filters = $filters | append (images.Sepia $args) }}
      {{- else if eq $method "Grayscale" }}
        {{- $filters = $filters | append images.Grayscale }}
      {{- else }}
        {{- warnf "Unsupported filter: %s" $method }}
      {{- end }}
    {{- end }}
  {{- end }}
  {{- $image = $image.Filter $filters }}
{{- end }}
{{- return $image }}