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June 2006

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2006.06.24 17:42 "GEOKEYDIRECTORY & JPEG Support", by Oded Orbach

hello,

I'm writing a code for copying a TIFF file from an input file to an output
file.

all going well except for two problems:

1. I'm having some problems with the GEOKEYDIRECTORY tag (I'm supporting
GEOTIFF as well..).

here is a part of my code:
int clone(const char* pIn, const char* pOut)
{
    tiff* pInTiff = XTIFFOpen(pIn, "r");
    tiff* pOutTiff = XTIFFOpen(pOut, "r");
    GTIF * geoTiffSrc = GTIFNew(PInTiff);
    GTIF * geoTiffDest = GTIFNew(POutTiff);
    unsigned short * keyDirectory;
    geocode_t shortVal;
    unsigned short Aux;
    shortVal = 0;
    GTIFKeyGet(geoTiffSrc, (geokey_t)GTModelTypeGeoKey,&shortVal,0,1);
    if (shortVal!=0) GTIFKeySet(geoTiffDest, (geokey_t)GTModelTypeGeoKey,
        TYPE_SHORT, 1, shortVal);
    // and so on with many other goekey tags...
    if (TIFFGetField(pInTiff, TIFFTAG_GEOKEYDIRECTORY, &Aux, &keyDirectory))
        TIFFSetField(pOutTiff, TIFFTAG_GEOKEYDIRECTORY, Aux, keyDirectory);
    //and so on with many other tags...
}

I used GTIFKeyGet for many GEOTIFF tags, and TIFFGetField for many TIFF
tags. when I tried to use only TIFFGetField, I've had problems with
reading the GEOTIFF tags.

one example of a file where everything goes well including this tag:
GEOKEYDIRECTORY = {1, 1, 0, 2, 1024, 0, 1, 0, 2048, 0, 1, 0} (for both
input and output file).

one example of a file where everything goes well except for this tag:
GEOKEYDIRECTORY = {1, 1, 0, 2, 1024, 0, 1, 32767, 2048, 0, 1, 0} (input
file).

GEOKEYDIRECTORY = {1, 1, 0, 1, 1024, 0, 1, 32767} (output file).
meaning that the tag number 2048 (GeographicTypeGeoKey) for some reason
was not copied successfully, and so is the GEOKEYDIRECTORY tag.
I have no idea what to do about it.
   
2. my application does not support JPEG compression. whenever a TIFF file
with a JPEG compression is inserted as an input to my application, when I
reach the call to TIFFReadTile (in order to read tiles from the input file
and copy the image), windows shows a message: JPEG compression support is
not configured.

the value of the TIFFTAG_COMPRESSION in this case is 7 (COMPRESSION_JPEG).
   
I'm trying to add a command at the beginning of the code:
#define JPEG_SUPPORT
  
or add also before that command another one:
#define COMPRESSION_SUPPORT
   
but it won't help.
   
what  should I do in order to be able to support JPEG compression TIFF
files?
   
thanks in advance and sorry for the long mail...