[gdal-dev] GDAL 1.7 Pb with GeoTiff Driver since revision 17563

[Régis Visière]

Thank you for the confirmation
--> Ticket created : #3259

Best regards

Régis Visière


----- Original Message ----- 
From: "Chaitanya kumar CH" <chaitanya.ch at gmail.com>
To: "Régis Visière" <regis.visiere at meteo.fr>
Sent: Thursday, December 03, 2009 1:55 PM
Subject: Re: [gdal-dev] GDAL 1.7 Pb with GeoTiff Driver since revision 17563


I am getting a segfault with the trunk(1.7) without any warning while
it's working fine with 1.6

Régis, please raise at http://trac.osgeo.org/gdal/newticket

2009/12/3 Régis Visière <regis.visiere at meteo.fr>:
> Hi all,
>
> I have a problem with Jpeg compressed Tiff images ang GDAL 1.7 since
> revision 17563
> The Geotiff driver can no longer read some of these images.
>
> These images have all the same characteristics :
> - GeoTiff Image
> - Jpeg Compression
> - RGB BitsPerSample 8
> - Photometric=YCbCr
> - Not Tiled
> - Width > 2000 and Height > 2000
> - Image OK in any standard Viewer
> - No problem with GDAL 1.6.2
>
> A simple command like :
> gdal_translate imgpb17.tif img.png -of PNG does not work.
> ( Windows XP 32b and Linux 64b )
>
> --> There's a lot of warnings :
> ....
> Warning 1: imgpb17.tif:fractional scanline not read
>
> ...10...20.Warning 1: imgpb17.tif:fractional scanline not read
> Warning 1: imgpb17.tif:fractional scanline not read
> ...
> Warning 1: imgpb17.tif:fractional scanline not read
> More than 1000 errors or warnings have been reported. No more will be
> reported f
> rom now.
> ..30...40...50...60...70...80...90...100 - done.
>
> and the output image is "black"
>
> As a workaround, I modified the following line in frmts/gtiff/geotiff.cpp
>
> line 4840
> if( !TIFFIsTiled(hTIFF)
> && nBitsPerSample == 8
> && nBlockYSize == nYSize
> && nYSize > 2000
> && !bTreatAsRGBA )
> {
> /* bTreatAsSplit = TRUE; */ <--------- }
>
> But it's only a workaround, not a solution
>
> Here is a test image : http://www.meteo.fr/special/gdal/imgpb17.tif
>
> Could you confirm that this is really a bug and not a mistake on my part.
>
> Best regards
>
> Régis Visière
>
>
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> gdal-dev at lists.osgeo.org
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>

-- 
Best regards,
Chaitanya kumar CH.

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