[gdal-dev] Black image pixels

[Raghav Singh via gdal-dev]

Hi,

I am loading one image on qgis and arcmap so that image is available till zoom 
20 but if I am loading after that image I am getting a black image but I tested 
one more image which is also available till same zoom but it loads at max zoom 
like 1:50 level also. For reference this is the black image passthru file data -


<GDAL_WMS>

    <Service name="TMS">

        
<ServerUrl>http://gserve-connect/v1/map/urn:eagleview.com.../tile?tileRow=${y}&amp;tileColumn=${x}&amp;zoomLevel=${z}&amp;minZoom=6&amp;maxZoom=20</ServerUrl>

    </Service>

    <DataWindow>

        <UpperLeftX>-20037508.34</UpperLeftX>

        <UpperLeftY>20037508.34</UpperLeftY>

        <LowerRightX>20037508.34</LowerRightX>

        <LowerRightY>-20037508.34</LowerRightY>

        <TileLevel>21</TileLevel>

        <TileCountX>1</TileCountX>

        <TileCountY>1</TileCountY>

        <YOrigin>bottom</YOrigin>

    </DataWindow>

    <Projection>EPSG:3857</Projection>

    <BlockSizeX>256</BlockSizeX>

    <BlockSizeY>256</BlockSizeY>

    <BandsCount>3</BandsCount>

    <Timeout>60</Timeout>

    <MaxConnections>4</MaxConnections>

    <ZeroBlockHttpCodes>204,404,500</ZeroBlockHttpCodes>

    <ZeroBlockOnServerException>true</ZeroBlockOnServerException>

</GDAL_WMS>


Now this file is same for this image urn for every query so query for black 
image pixel - 
SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&CRS=EPSG:3857&BBOX=-7081493.48537824768573046,5579761.67419921327382326,-7081372.5176363131031394,5579868.71160078886896372&WIDTH=1016&HEIGHT=899&LAYERS=PICT-NSPVSC22-OUKuEawvk2&STYLES=&EXCEPTIONS=XML&FORMAT=image/png&BGCOLOR=0xFEFFFF&TRANSPARENT=TRUE&

and for another zoom level where it's loading fine - 
SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&CRS=EPSG:3857&BBOX=-7081500.20580835547298193,5579755.72767690382897854,-7081365.79720620531588793,5579874.65812309831380844&WIDTH=1016&HEIGHT=899&LAYERS=PICT-NSPVSC22-OUKuEawvk2&STYLES=&EXCEPTIONS=XML&FORMAT=image/png&BGCOLOR=0xFEFFFF&TRANSPARENT=TRUE&

Any idea on this?

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