Problem resolved, it was just a configuration error in QGis.
Thank you !

Regards,
Maxime

On Wednesday, August 19, 2015 at 10:51:07 AM UTC+11, collin maxime wrote:
>
> Thank you.
> I'm sure of my arguments order, it's not common but correct in this case.
> I read the image after writer->Update() with a second reader and I can see 
> that good values are affected well. However, when I open the image in QGIS, 
> I have only the value 0.
>
> Regards,
> Maxime
>
> On Tuesday, August 18, 2015 at 7:49:52 PM UTC+11, Grizonnet Manuel wrote:
>>
>> Hi Maxime, 
>>
>> I did not look in detail at your code but the message is just a warning 
>> related to the fact that as there will be no progress report. It should 
>> still produce the image as output of the writer filter. 
>>
>> Take care also as you're reading the first argument of the program as 
>> the output image and not the input(constchar*inputFilename =argv[2];). 
>> Not sure if you want to do this. 
>>
>> AFAIK, you're program should work and produce an image fill with zero 
>> everywhere apart from pixels modify in the while loop. 
>>
>> Regards, 
>>
>

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