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February 2002

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2002.02.20 00:27 "problem writing TIFF file in one strip", by David Strip

2002.02.20 21:40 "Re: problem writing TIFF file in one strip", by David Strip

2002.02.20 00:27 "problem writing TIFF file in one strip", by David Strip

Here's a snippet of my writer:

  TIFFSetField(tif, TIFFTAG_IMAGELENGTH, image.rows());
  TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, image.cols());
  TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
  TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, image.rows());
  TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
  int bytes_written = TIFFWriteRawStrip(tif, 1, reinterpret_cast<void
*>(image[0]), image.n() * 4);
  if (bytes_written != image.n() * 4)
    uiReportError("writeRGBTIFF: problem writing data");
  TIFFClose(tif);

I've traced td->td_nstrips through the writing of the raw strip. It is
initially computed as one (correct), but by the end it has been
incremented to 2 by this piece of TIFFWriteRawStrip:

 if (strip >= td->td_nstrips) {
  if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
   TIFFError(tif->tif_name,
  "Can not grow image by strips when using separate planes");
   return ((tsize_t) -1);
  }
  /*
   * Watch out for a growing image.  The value of
   * strips/image will initially be 1 (since it
   * can't be deduced until the imagelength is known).
   */
  if (strip >= td->td_stripsperimage)
   td->td_stripsperimage =
       TIFFhowmany(td->td_imagelength,td->td_rowsperstrip);
  if (!TIFFGrowStrips(tif, 1, module))
   return ((tsize_t) -1);

by the time we get to writing the directory in TIFFClose, td->td_nstrips
is still 2, and that's what gets written. When I then try to read the
file with TIFFOpen, I get an error on the count of strip_offsets, which
the reader computes (correctly) to be 1.

I'm compiling using VC++ 6.0 on NT, but as far as I can tell, the
program is behaving exactly as the code demands.

All help appreciated.


--
David Strip                           Eastman Kodak Company
david.strip@kodak.com        2901 Juan Tabo NE, Suite 210
505-294-8515                      Albuquerque, NM  87112-1881
505-294-8565 (fax)