[gdal-dev] VRT KernelFilteredSource and overviews

[Rahkonen Jukka (MML)]

Hi,

I was playing with kernel filters in VRT and using this really applies sharpen filter on-the-fly when looking the image at native resolution with QGIS:

<VRTRasterBand dataType="Byte" band="1">
    <ColorInterp>Red</ColorInterp>
    <KernelFilteredSource>
      <SourceFilename relativeToVRT="1">image.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="12000" RasterYSize="12000" DataType="Byte" BlockXSize="12000" BlockYSize="1" />
      <SrcRect xOff="0" yOff="0" xSize="12000" ySize="12000" />
      <DstRect xOff="0" yOff="0" xSize="12000" ySize="12000" />
        <Kernel normalized="0">
          <Size>3</Size>
           <Coefs>0 -1 0 -1 5 -1 0 -1 0</Coefs>
  </Kernel>
    </KernelFilteredSource>
  </VRTRasterBand>

However, filter is not applied to overviews which means that image looks different when I zoom out. Is this the intended behavior?

-Jukka Rahkonen-
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