[gdal-dev] Making a thumbnail truecolor jpeg from a 4-band GeoTiff

[Even Rouault]

Le samedi 15 août 2015 11:15:33, NASAHARA Kenlo a écrit :
> Hi, GDAL people,
> 
> I am trying to make a thumbnail from a GeoTIFF image
> using gdaladdo and am confronting a problem.
> My GeoTIFF file is ALOS AVNIR2 file (4 bands).
> 
> After browsing the mannual (http://www.gdal.org/gdaladdo.html),
> I tried the following command:
> $ gdaladdo -ro --config COMPRESS_OVERVIEW JPEG --config
> PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL
> ALAV2A273212850-OORIRFU.RCRefG.GEO.tif 16
> 
> then I got the following errors:
> ERROR 6: PHOTOMETRIC_OVERVIEW=YCBCR requires a source raster with only 3
> bands (RGB) Overview building failed.
> 
> All I want to do is create a small true-color jpeg image (RGB=321)
> from the 4 band satellite image in GeoTIFF format. I appreciate
> your suggestions.

Kenlo,

Try instead:
gdal_translate -of JPEG -b 3 -b 2 -b 1 in.tif out.jpg -outsize 6.25% 6.25% 

Best regards,

Even

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