[%- DEFAULT outfile = file -%]
[%- 
     USE bio = BioChrome("${image_src}/$file");
     IF color;
          bio.colors(color);
     END;
     IF alpha;
      bio.alphas(alpha);
     END;
     bio.write_file("${image_dest}/$outfile");
-%]
<img src="[% images %]/[% outfile %]">