2009.05.07 08:14 "[Tiff] [Q] TIFFReadRGBAImage (about read COMPRESSION_JPEG imagefile) of libtiff.", by masui/増井　郁久

I am japanese. my name is I.masui.

I must be good at English and forgive the thing that cannot be written.

It is a question on TIFFReadRGBAImage (about read COMPRESSION_JPEG imagefile) of libtiff.

======= (*Quotation http://www.libtiff.org/libtiff.html) =======
#include "tiffio.h"
main(int argc, char* argv[])
{
    TIFF* tif = TIFFOpen(argv[1], "r");
    if (tif) {
        uint32 w, h;
        size_t npixels;
        uint32* raster;

        TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &w);
        TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &h);
        npixels = w * h;
        raster = (uint32*) _TIFFmalloc(npixels * sizeof (uint32));
        if (raster != NULL) {
            if (TIFFReadRGBAImage(tif, w, h, raster, 0)) {
                        // OK(when COMPRESSION_CCITTFAX4).
            }
                 else {
                        // error (when COMPRESSION_JPEG) <<<<<<<<
                 }
            _TIFFfree(raster);
        }
        TIFFClose(tif);
    }
    exit(0);
}
  (note. COMPRESSION_CCITTFAX4,COMPRESSION_JPEG is got by
                       "uint16 compress; TIFFGetField(m_tif, TIFFTAG_COMPRESSION, &compress);"
======================================================================

It becomes an error by "TIFFReadRGBAImage" at "COMPRESSION_JPEG"-ImageFile(TIFF) though it is possible to read at "COMPRESSION_CCITTFAX4"-ImageFile(TIFF) by the above-mentioned reading method.

How can I read at COMPRESSION_JPEG? <<<<<<<<

<end>