Even,
thanks for exhaustive explanation and testing.

On Wed, Aug 22, 2012 at 2:37 PM, Even Rouault
<[email protected]> wrote:
>> I found in GDAL ecwdataset.cpp that it is treating  single row
>> requests in IRasterIO in a special way:
>
> I tried the following Python script that must be representative of how QGIS 
> must
> do picking (I guess it does a RasterIO(, .... x, y, 1, 1, ... 1, 1) )

Yes.

> I suppose your workaround in QGIS will be to read 1x2 pixel or something like 
> that.

Yes, I have used 2x2.

Radim
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