[mapguide-users] raster ECW transparency

[Jérôme DUCKERS]

Hi thanks Johan,

I'm working too with AIMS, Gdal was a test.

I have tried your command, but for the moment, the result is the same that
i have for the moment, a cloud.
What soft are you using for conversion ?
We are using Erdas Imagine.

I took a tif, then i generate an Ecw (with erdas imagine)
I use your command.
And finaly, i regenerate my Ecw based on my new tif.

With Autocad Map3d, i see that my tiff is right (i can do transparency on
white color), but when my tiff is converted,
i apply the transparency on white, and i see a cloud near my image

it's very difficult :'(


2013/2/5 Zac Spitzer <zac.spitzer at gmail.com>

> if you need some GDAL improvements, you could always engage Trevor to make
> them
>
>
> On Tue, Feb 5, 2013 at 9:57 AM, Johan Van de Wauw <
> johan.vandewauw at gmail.com> wrote:
>
>> I've not used the GDAL provider myself, but using AIMS raster driver the
>> only way I found to make ecw transparent was adding a alpha layer. I did
>> this using the gdal command line utility "nearblack" with the setalpha
>> option:
>> nearblack -setalpha -o out.tif in.ecw
>> And afterwards converting the output to ecw again (exporting to ecw was
>> not supported by nearblack).
>>
>> Johan
>>
>>
>>
>> On Mon, Feb 4, 2013 at 5:27 PM, StuartSteel <
>> stuart.steel at atkinsglobal.com> wrote:
>>
>>> Bump.
>>>
>>> I cannot believe that Duck and myself are the only two people who require
>>> nodata transparency using the GDAL raster provider?
>>>
>>> Can anyone shed some light on this, please?
>>>
>>>
>>>
>>> --
>>> View this message in context:
>>> http://osgeo-org.1560.n6.nabble.com/raster-ECW-transparency-tp5029485p5032030.html
>>> Sent from the MapGuide Users mailing list archive at Nabble.com.
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>>
>>
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>
>
> --
> Zac Spitzer
> Solution Architect / Director
> Ennoble Consultancy Australia
> +61 405 847 168
>
>
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