[mapserver-users] Raster Image Quality
francesco
francesco.pirotti at unipd.it
Tue Dec 8 08:48:13 EST 2009
shp2img requires a mapfile... what kind of image outpuformat did you use
in your mapfile?
Shp2img resamples paletted black and white images and that does not
give a great result usually. you could try to output grey scale 8-bit
images (byte but not paletted). Did you also use pyramid layers or does
the maptiler program also give you different scales?
Francesco
Jerry O'Sullivan ha scritto:
> 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
>>
>>
>>
>>
>
>
>
--
*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 <mailto:francesco.pirotti at unipd.it>
Phone: +39 049 827 2710
Phone: +39 349 55 39 261
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