Global Mapper v26.0

4 Band ECW broken

PatG
PatG Global Mapper UserTrusted User
edited April 2010 in Bug Report
The GM11 patch of 31st march appears to have broken the proper loading of 4 band ECW files. If I go back to the build of 02nd March GM11 loads 4 band ECW's correctly.

Something untoward has obviously happened between these two builds....

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  • global_mapper
    global_mapper Administrator
    edited April 2010
    Pat,

    The old behavior was restored as unfortunately the ECW format does not provide an indication of whether a band is a data band or an alpha channel, so the change was causing ECW files with an alpha channel to not be recognized as an alpha channel, so now the old behavior of always treating the last band of a 2- or 4-band ECW file as an alpha channel was restored.

    What you should be able to do if you have an ECW file where the last band is not an alpha channel is to select the layer in the Control Center, press Options, then on the Band Setup tab check the box to ignore the alpha channel.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com

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