[Gdal-dev] RVB JPEG

François Prunayre fx.prunayre at oieau.fr
Tue Jul 19 10:00:35 EDT 2005


TIFF file is pseudocolored in my case. Your exemple works fine for me. 

Thanks a lot.
Francois


echo -- Reprojection en WGS84
gdalwarp -s_srs '+proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=0 +k_0=0.99987742
+x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515
+towgs84=-168,-60,320,0,0,0,0 +pm=paris +units=m +no_defs' -t_srs
'+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs' $1 ./tmp/$2.TIF

echo -- Conversion Pseudocolor vers RGB
pct2rgb.py tmp/$2.TIF tmp/dummy.TIF

echo -- Conversion en JPEG
gdal_translate -of JPEG -co WORLDFILE=ON tmp/dummy.TIF tmp/$2.JPG

echo -- Suppression fichier temporaire
rm -f tmp/dummy.TIF
rm -f tmp/$2.TIF

echo -- Renomme fichier de georeferencement
mv tmp/$2.wld tmp/$2.jgw 

-----Message d'origine-----
De : Frank Warmerdam [mailto:fwarmerdam at gmail.com] 
Envoyé : mardi 19 juillet 2005 15:19
À : François Prunayre
Cc : gdal-dev at xserve.flids.com
Objet : Re: [Gdal-dev] RVB JPEG

On 7/19/05, François Prunayre <fx.prunayre at oieau.fr> wrote:
>  
> Hi list,
> When using gdal_translate to convert GeoTIFF to JPEG, I get Greyscale
JPEG.
> How to get RVB JPEG instead ? 
>   
> gdal_translate -of JPEG -co WORLDFILE=ON tmp/F056606.TIF 
> tmp/F056606.JPG

François,

Is the input TIFF file a greyscale single band image?   If so, they
a greyscale output would seem appropriate. 

If the input TIFF file is pseudocolored, then you would need to first
convert it to RGB format and then encode that to JPEG. 

eg. 

pct2rgb.py tmp/F056606.TIF tmp/very_temporary.tif gdal_translate -of JPEG
-co WORLDFILE=ON \
  tmp/very_temporary.tif  tmp/F056606.JPG rm tmp/very_temporary.tif

If this doesn't cover your situation, perhaps you could provide a gdalinfo
report on the input file. 

Best regards,
-- 
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warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Programmer for Rent

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