ECW appears blank

Hello, 
I have an issue with opening/importing ECW images. Bare with me please as this is a hard one to explain.
I have no problem with opening any JPG or GeoTiff image. I can import ECW images that I havent created with Global Mapper
However when I try to import an ECW image that I have created with Global mapper into Global mapper the images appear blank, I can open the same ECW file with 12d or Qgis and the ECW appears. There must be a setting or something I have changed that isnt allowing me to view ECW images that I have created with Global Mapper in Global mapper. I have a feeling it has something to do with Make Background (Void) Pixels transparent. 
Where the plot thickens further is that I can open ECW images that I created months ago with Global mapper and they appear as they should, but if I open ECW files with Global Mapper that I created with Global Mapper recently they all appear blank.
Again to experiment I imported the blank ECW into QGIS where it is visible, I exported the ECW as a geotiff and reopened with Global mapper and again the image is blank.
Can someone offer some guidance? What am I missing here?

Answers

  • FILENAME=D:\12d\WSA\WSA BE\190927 WSA BE Project Extent Plot\WSA BE ECW 600mm GSD.ecw
    DESCRIPTION=WSA BE ECW 600mm GSD.ecw
    UPPER LEFT X=279090.865
    UPPER LEFT Y=6251927.856
    LOWER RIGHT X=302010.766
    LOWER RIGHT Y=6242557.702
    WEST LONGITUDE=150° 36' 35.8573" E
    NORTH LATITUDE=33° 50' 59.4427" S
    EAST LONGITUDE=150° 51' 35.5830" E
    SOUTH LATITUDE=33° 56' 19.8416" S
    UL CORNER LONGITUDE=150° 36' 44.3367" E
    UL CORNER LATITUDE=33° 50' 59.4427" S
    UR CORNER LONGITUDE=150° 51' 35.5830" E
    UR CORNER LATITUDE=33° 51' 15.8184" S
    LR CORNER LONGITUDE=150° 51' 27.9810" E
    LR CORNER LATITUDE=33° 56' 19.8416" S
    LL CORNER LONGITUDE=150° 36' 35.8573" E
    LL CORNER LATITUDE=33° 56' 03.4140" S
    PROJ_DESC=MGA (Map Grid of Australia) / GDA94 / meters
    PROJ_DATUM=GDA 94 (AUSTRALIAN GEODETIC 1994)
    PROJ_UNITS=meters
    EPSG_CODE=EPSG:28356
    COVERED AREA=214.76 sq km
    LOAD TIME=0.38 s
    NUM COLUMNS=36138
    NUM ROWS=14774
    NUM BANDS=4
    COLOR BANDS=0,1,2
    PIXEL WIDTH=0.634 meters
    PIXEL HEIGHT=0.634 meters
    BIT DEPTH=32
    PROJ_NAME=EPSG:28356
    DATUM_NAME=EPSG:28356
    TARGET_COMPRESSION=1:6

  • bmg_bobbmg_bob Global Mapper Programmer Posts: 2,061
    Hello,

    I suggest that you contact Blue Marble Support directly via email (geohelp@bluemarblegeo.com) for help with this problem. Please provide sample ECW file that can be used to reproduce your issue.

    Cheers,
    Bob
  • Will do,
    Thanks Bob
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