[gdal-dev] how to convert UInt16 Tiff

[jr.morreale at enoreth.net]

On Mon, 23 Apr 2012 16:54:10 +0200, Even Rouault wrote:
> Selon jr.morreale at enoreth.net:
>
>> Hi,
>>
>> I've a few thousand aerial uncompressed tiff photography that I 
>> would
>> like to convert to tiff with jpeg compression, unfortunatly I can't
>> figure the right options to set to overcome the following error :
>>
>> gdal_translate -of Gtiff -co "COMPRESS=JPEG"
>> "D:\uncompressed_original.tif" "D:\tiff_jpeg_copy.tif"
>>
>> ERROR 1: JPEGSetupEncode:BitsPerSample 16 not allowed for JPEG
>> ERROR 1: An error occured while writing a dirty block
>> ERROR 1: JPEGSetupEncode:BitsPerSample 16 not allowed for JPEG
>>
>> I've tried to use -co NBITS without success (gdal 1.9), the output
>> becomes a paletted file.
>
> Did you try -co BITS=12 ? JPEG compression only supports 8 or 12
> bits. (For 12
> bit support, you must have a build of GDAL configured with its
> internal libtiff
> and internal libjpeg compiled with 12 bit support)

thanks for the reply, I did try with NBITS=8 and 12 with osgeo4w's gdal 
and tamas' nightly build but the output results are incorrect

Here is a sample file (93Mo) :
http://dl.free.fr/iFT4hH3Yj

I'll try to rebuild gdal on my linux box with the internal libs