Map services can also export the map as an image.
http://gis.cityofboston.gov/arcgis/rest/services/Infrastructure/OpenData/MapServer/export? bbox=-71.087379,42.348324,-71.041031,42.370142 &bboxSR=4326 &layers=show:0 &size=256,256 &imageSR=102100 &format=png &transparent=true &f=image
Using the layer definition you can generate a filtered image view.
http://gis.cityofboston.gov/arcgis/rest/services/Infrastructure/OpenData/MapServer/export? bbox=-71.087379,42.348324,-71.041031,42.370142 &bboxSR=4326 &layers=show:0 &layerDefs={ "0" : "SURVEY='MISSING SURVEY'"} &size=256,256 &imageSR=102100 &format=png &transparent=true &f=image