[ELGIS] Re: [gdal-dev] Issue GDAL with JPEG-compressed TIFFS

[Peter Hopfgartner]

Hi Evan

Indeed, the external libtiff is used and is version 
libtiff-3.9.4-1.el6_0.3.x86_64.
In the mean time I did a quick compile of gdal-1.9.0 with internal 
libtiff and the square disappeared.
Probably it would be a wise decision to switch to libtiff4 quickly, as 
far as ELGIS is concerned.

Thanks,

Peter

On 02/03/2012 01:41 PM, Even Rouault wrote:
> Peter,
>
> Does ELGIS GDAL uses internal libtiff (4.0beta) or external libtiff (3.8 or 3.9)
> ? I guess it is external libtiff, and then it could explain the issues you have
> with overviews and JPEG compression. There have been fixes in libtiff 4 to
> better support that situation (multiple IFDs with compression). Altertantively,
> you could probably workaround that by generating external overviews (add -ro to
> the gdaladdo command line), but no guarantees. By the way, the --config
> COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW PIXEL --config
> JPEG_QUALITY_OVERVIEW 90 options only apply to external overviews, not internal
> ones.
>
>> I'm doing quite some experiments with GDAL and image compression these days
>>
>> I do have an issue with geotiff 1.3/gdal 1.8.1 on CentOS 6 with packages
>> from ELGIS. The story goes like this:
>>
>> I create tiffs with
>>
>> gdal_translate -of GTiff -co COMPRESS=JPEG -co JPEG_QUALITY=90
>>    -co "TILED=YES" -co "BLOCKXSIZE=512" -co "BLOCKYSIZE=512"<infile>
>> <outfile>
>>
>> and then add overviews with (I do have to add the overlays in distinct
>> steps, otherwise gdaladdo aborts with an error message).
>>
>> gdaladdo --config COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW
>> PIXEL --config JPEG_QUALITY_OVERVIEW 90 -r average<outfile>  3
>> gdaladdo  --config COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW
>> PIXEL --config JPEG_QUALITY_OVERVIEW 90 -r average<outfile>  9
>> gdaladdo --config COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW
>> PIXEL --config JPEG_QUALITY_OVERVIEW 90 -r average<outfile>  27
>> gdaladdo --config COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW
>> PIXEL --config JPEG_QUALITY_OVERVIEW 90 -r average<outfile>  81
>>
>> (Trying with power-of-2-steps gives the same result. If I drop all
>> options from gdaladdo: same result).
>>
>> I'll create a WMS service with MapServer 5.6.7 and do get a big red
>> square in the image. The square is "fixed" to the geografical position,
>> e.g. if I move the extend the square moves too. The square is situated
>> in the corner of the tiff file.
>> It appears only at some scales. If I change it very slightly, the square
>> remqins, if I change for more then approx 1%, it disappears.
>>
>> I've put the two images at
>>
>> http://www.r3-gis.com/gdal_issues/tiff_with_jpegcompression_and_overviews.jpeg
>> and
>> http://www.r3-gis.com/gdal_issues/tiff_with_nocompression_and_overviews.jpeg
>> .
>>
>> The problem disappears if I do not run gdaladdo on the images or when I
>> do not use Jpeg compression:
>>
>> gdal_translate -of GTiff  -co "TILED=YES" -co "BLOCKXSIZE=512" -co
>> "BLOCKYSIZE=512"<origfile>  <targetfile>
>>
>> There are some hits for
>>
> http://www.google.com/search?client=ubuntu&channel=fs&q=mapserver+artefacts+in+raster+gdal&ie=utf-8&oe=utf-8,
>> but mostly related to older versions of GDAL and without resolution.
>>
>>
>> Thanks,
>>
>> Peter
>>
>> --
>>
>> Peter Hopfgartner
>> R3 GIS Srl - GmbH
>> www.r3-gis.com
>>
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>


-- 
Peter Hopfgartner
R3 GIS Srl - GmbH
web  : www.r3-gis.com