[mapserver-users] Raster Image Quality
Jerry O'Sullivan
jeremiahosullivan at gmail.com
Tue Dec 8 07:53:34 EST 2009
Francesco,
They are black & white images.
Are you suggesting doing some processing with GDAL first or use some directives in the map file to improve image quality?
Thanks
Jerry
>Jerry , your color table looks like it is of a black and white image
>(255,255,255,255 is white, 0,0,0,255 is black) looks very strange to me.
>Your problem could also be that you use 8-bit color images, you could
>try to use RGB images which help when having to resample the tiles
>(which is what shp2img does when it draws your image)
>Cheers,
>Francesco Pirotti
>
>Jerry O'Sullivan ha scritto:
>> Hi,
>>
>> Can anyone give me a few tips on producing better quality images from my raster maps. I chopped it up using maptiler - http://www.maptiler.org - and the image quality is top notch. When I use MapServer shp2img the quality isn't as good. I looked at the images in IfranView and the MapTiler image has a lot more unique colors
>>
>> Here is the gdalinfo for one of the tiles
>>
>> Image Structure Metadata:
>> COMPRESSION=LZW
>> INTERLEAVE=BAND
>> Corner Coordinates:
>> Upper Left ( 316000.000, 271000.000) ( 6d14'39.88"W, 53d40'33.00"N)
>> Lower Left ( 316000.000, 268000.000) ( 6d14'43.91"W, 53d38'56.00"N)
>> Upper Right ( 320000.000, 271000.000) ( 6d11'2.06"W, 53d40'29.75"N)
>> Lower Right ( 320000.000, 268000.000) ( 6d11'6.23"W, 53d38'52.75"N)
>> Center ( 318000.000, 269500.000) ( 6d12'53.02"W, 53d39'42.89"N)
>> Band 1 Block=20000x1 Type=Byte, ColorInterp=Palette
>> Color Table (RGB with 256 entries)
>> 0: 255,255,255,255
>> 1: 0,0,0,255
>> 2: 0,0,0,255
>> 3: 0,0,0,255
>> 4: 0,0,0,255
>> 5: 0,0,0,255
>> 6: 0,0,0,255
>> 7: 0,0,0,255
>> 8: 0,0,0,255
>> 9: 0,0,0,255
>> 10: 0,0,0,255
>> 11: 0,0,0,255
>> 12: 0,0,0,255
>> 13: 0,0,0,255
>> 14: 0,0,0,255
>> 15: 0,0,0,255
>> 16: 0,0,0,255
>> 17: 0,0,0,255
>> 18: 0,0,0,255
>> 19: 0,0,0,255
>> 20: 0,0,0,255
>> 21: 0,0,0,255
>> 22: 0,0,0,255
>> 23: 0,0,0,255
>> 24: 0,0,0,255
>> 25: 0,0,0,255
>> 26: 0,0,0,255
>> 27: 0,0,0,255
>> 28: 0,0,0,255
>> 29: 0,0,0,255
>> 30: 0,0,0,255
>> 31: 0,0,0,255
>> 32: 0,0,0,255
>> 33: 0,0,0,255
>> 34: 0,0,0,255
>> 35: 0,0,0,255
>> 36: 0,0,0,255
>> 37: 0,0,0,255
>> 38: 0,0,0,255
>> 39: 0,0,0,255
>> 40: 0,0,0,255
>> 41: 0,0,0,255
>> 42: 0,0,0,255
>> 43: 0,0,0,255
>> 44: 0,0,0,255
>> 45: 0,0,0,255
>> 46: 0,0,0,255
>> 47: 0,0,0,255
>> 48: 0,0,0,255
>> 49: 0,0,0,255
>> 50: 0,0,0,255
>> 51: 0,0,0,255
>> 52: 0,0,0,255
>> 53: 0,0,0,255
>> 54: 0,0,0,255
>> 55: 0,0,0,255
>> 56: 0,0,0,255
>> 57: 0,0,0,255
>> 58: 0,0,0,255
>> 59: 0,0,0,255
>> 60: 0,0,0,255
>> 61: 0,0,0,255
>> 62: 0,0,0,255
>> 63: 0,0,0,255
>> 64: 0,0,0,255
>> 65: 0,0,0,255
>> 66: 0,0,0,255
>> 67: 0,0,0,255
>> 68: 0,0,0,255
>> 69: 0,0,0,255
>> 70: 0,0,0,255
>> 71: 0,0,0,255
>> 72: 0,0,0,255
>> 73: 0,0,0,255
>> 74: 0,0,0,255
>> 75: 0,0,0,255
>> 76: 0,0,0,255
>> 77: 0,0,0,255
>> 78: 0,0,0,255
>> 79: 0,0,0,255
>> 80: 0,0,0,255
>> 81: 0,0,0,255
>> 82: 0,0,0,255
>> 83: 0,0,0,255
>> 84: 0,0,0,255
>> 85: 0,0,0,255
>> 86: 0,0,0,255
>> 87: 0,0,0,255
>> 88: 0,0,0,255
>> 89: 0,0,0,255
>> 90: 0,0,0,255
>> 91: 0,0,0,255
>> 92: 0,0,0,255
>> 93: 0,0,0,255
>> 94: 0,0,0,255
>> 95: 0,0,0,255
>> 96: 0,0,0,255
>> 97: 0,0,0,255
>> 98: 0,0,0,255
>> 99: 0,0,0,255
>> 100: 0,0,0,255
>> 101: 0,0,0,255
>> 102: 0,0,0,255
>> 103: 0,0,0,255
>> 104: 0,0,0,255
>> 105: 0,0,0,255
>> 106: 0,0,0,255
>> 107: 0,0,0,255
>> 108: 0,0,0,255
>> 109: 0,0,0,255
>> 110: 0,0,0,255
>> 111: 0,0,0,255
>> 112: 0,0,0,255
>> 113: 0,0,0,255
>> 114: 0,0,0,255
>> 115: 0,0,0,255
>> 116: 0,0,0,255
>> 117: 0,0,0,255
>> 118: 0,0,0,255
>> 119: 0,0,0,255
>> 120: 0,0,0,255
>> 121: 0,0,0,255
>> 122: 0,0,0,255
>> 123: 0,0,0,255
>> 124: 0,0,0,255
>> 125: 0,0,0,255
>> 126: 0,0,0,255
>> 127: 0,0,0,255
>> 128: 0,0,0,255
>> 129: 0,0,0,255
>> 130: 0,0,0,255
>> 131: 0,0,0,255
>> 132: 0,0,0,255
>> 133: 0,0,0,255
>> 134: 0,0,0,255
>> 135: 0,0,0,255
>> 136: 0,0,0,255
>> 137: 0,0,0,255
>> 138: 0,0,0,255
>> 139: 0,0,0,255
>> 140: 0,0,0,255
>> 141: 0,0,0,255
>> 142: 0,0,0,255
>> 143: 0,0,0,255
>> 144: 0,0,0,255
>> 145: 0,0,0,255
>> 146: 0,0,0,255
>> 147: 0,0,0,255
>> 148: 0,0,0,255
>> 149: 0,0,0,255
>> 150: 0,0,0,255
>> 151: 0,0,0,255
>> 152: 0,0,0,255
>> 153: 0,0,0,255
>> 154: 0,0,0,255
>> 155: 0,0,0,255
>> 156: 0,0,0,255
>> 157: 0,0,0,255
>> 158: 0,0,0,255
>> 159: 0,0,0,255
>> 160: 0,0,0,255
>> 161: 0,0,0,255
>> 162: 0,0,0,255
>> 163: 0,0,0,255
>> 164: 0,0,0,255
>> 165: 0,0,0,255
>> 166: 0,0,0,255
>> 167: 0,0,0,255
>> 168: 0,0,0,255
>> 169: 0,0,0,255
>> 170: 0,0,0,255
>> 171: 0,0,0,255
>> 172: 0,0,0,255
>> 173: 0,0,0,255
>> 174: 0,0,0,255
>> 175: 0,0,0,255
>> 176: 0,0,0,255
>> 177: 0,0,0,255
>> 178: 0,0,0,255
>> 179: 0,0,0,255
>> 180: 0,0,0,255
>> 181: 0,0,0,255
>> 182: 0,0,0,255
>> 183: 0,0,0,255
>> 184: 0,0,0,255
>> 185: 0,0,0,255
>> 186: 0,0,0,255
>> 187: 0,0,0,255
>> 188: 0,0,0,255
>> 189: 0,0,0,255
>> 190: 0,0,0,255
>> 191: 0,0,0,255
>> 192: 0,0,0,255
>> 193: 0,0,0,255
>> 194: 0,0,0,255
>> 195: 0,0,0,255
>> 196: 0,0,0,255
>> 197: 0,0,0,255
>> 198: 0,0,0,255
>> 199: 0,0,0,255
>> 200: 0,0,0,255
>> 201: 0,0,0,255
>> 202: 0,0,0,255
>> 203: 0,0,0,255
>> 204: 0,0,0,255
>> 205: 0,0,0,255
>> 206: 0,0,0,255
>> 207: 0,0,0,255
>> 208: 0,0,0,255
>> 209: 0,0,0,255
>> 210: 0,0,0,255
>> 211: 0,0,0,255
>> 212: 0,0,0,255
>> 213: 0,0,0,255
>> 214: 0,0,0,255
>> 215: 0,0,0,255
>> 216: 0,0,0,255
>> 217: 0,0,0,255
>> 218: 0,0,0,255
>> 219: 0,0,0,255
>> 220: 0,0,0,255
>> 221: 0,0,0,255
>> 222: 0,0,0,255
>> 223: 0,0,0,255
>> 224: 0,0,0,255
>> 225: 0,0,0,255
>> 226: 0,0,0,255
>> 227: 0,0,0,255
>> 228: 0,0,0,255
>> 229: 0,0,0,255
>> 230: 0,0,0,255
>> 231: 0,0,0,255
>> 232: 0,0,0,255
>> 233: 0,0,0,255
>> 234: 0,0,0,255
>> 235: 0,0,0,255
>> 236: 0,0,0,255
>> 237: 0,0,0,255
>> 238: 0,0,0,255
>> 239: 0,0,0,255
>> 240: 0,0,0,255
>> 241: 0,0,0,255
>> 242: 0,0,0,255
>> 243: 0,0,0,255
>> 244: 0,0,0,255
>> 245: 0,0,0,255
>> 246: 0,0,0,255
>> 247: 0,0,0,255
>> 248: 0,0,0,255
>> 249: 0,0,0,255
>> 250: 0,0,0,255
>> 251: 0,0,0,255
>> 252: 0,0,0,255
>> 253: 0,0,0,255
>> 254: 0,0,0,255
>> 255: 0,0,0,255
>>
>> Thanks,
>> Jerry
>> _______________________________________________
>> mapserver-users mailing list
>> mapserver-users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
>>
>>
>
>
>--
>*Francesco Pirotti*
>Dep. TESAF
>CIRGEO – Interdepartmental Research Center on Cartography Photogrammetry
>Remote Sensing and G.I.S.
>University of Padova
>Web: http://www.cirgeo.unipd.it/cirgeo/francescopirotti.htm
>Email: francesco.pirotti at unipd.it
>Phone: +39 049 827 2710
>Phone: +39 349 55 39 261
>
>
>
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