PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs"],AUTHORITY["EPSG","3857"]] -14231349.27532584, 38.07321727042201, 0, 6717493.444643996, 0, -38.07321727042201 Red vrt_webmercator.vrt 1 0:0,1:253,2:222,3:187,4:154,5:122,6:93,7:67,8:47,9:34,10:30,11:33,12:37,13:42,14:47,15:53,16:59,17:65,18:70,19:72,20:72,21:68,255:0,255.999999999999943:0,256:0 Green vrt_webmercator.vrt 1 0:0,1:231,2:227,3:223,4:217,5:209,6:200,7:191,8:180,9:168,10:156,11:144,12:132,13:120,14:108,15:96,16:82,17:68,18:52,19:37,20:20,21:1,255:0,255.999999999999943:0,256:0 Blue vrt_webmercator.vrt 1 0:0,1:37,2:24,3:39,4:60,5:81,6:99,7:113,8:124,9:132,10:137,11:140,12:142,13:142,14:142,15:141,16:139,17:135,18:128,19:118,20:103,21:84,255:0,255.999999999999943:0,256:0 Alpha vrt_webmercator.vrt 1 0:0,1:255,2:255,3:255,4:255,5:255,6:255,7:255,8:255,9:255,10:255,11:255,12:255,13:255,14:255,15:255,16:255,17:255,18:255,19:255,20:255,21:255,255:0,255.999999999999943:0,256:0