map2img -m opacity-wms.map -o ttt.png -all_debug 3

mapserv -nh QUERY_STRING="MAP=opacity-wms.map&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=50.43646181818179741,-137.2127006060605936,81.69507636363634617,-85.115009696969679&CRS=EPSG:4326&WIDTH=990&HEIGHT=594&LAYERS=bathymetry,park&STYLES=,&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE%20HTTP/1.1" > test.png