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August 2005

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2005.08.04 20:02 "changing orientation tags in multipage tiff files", by Bradley Feldman

2005.08.04 23:42 "Re: changing orientation tags in multipage tiff files", by Bradley Feldman

2005.08.04 23:50 "Re: changing orientationtags in multipage tiff files", by Joris Van Damme

2005.08.04 20:02 "changing orientation tags in multipage tiff files", by Bradley Feldman

Hi all:

I'm new to this library and this list and looking for some helpful tips on
writing a routine to quickly and efficiently change the orientation tag of
every page of a multipage file.

I see plenty of examples with single page files, but nothing with
multipagers.

As a primer, I've experimented with tiffset but found it only effects the
first page of a multitiff file.

Likewise, I've written a program that is basically simple loop that reads a
tiff file's directories, sets the orientation tag and writes out the
directory to a new file, but I'm not getting any image data.  How so do I
get the whole input file, page by page with just the orientation changed to
the output file?  I'm obviously missing some steps

Here's some pseudo code I'm using:

  infile = TIFFOpen("input.tif", "r");
  outfile = TIFFOpen("output.tif", "w");
  do {
    TIFFGetFieldDefaulted(infile, TIFFTAG_ORIENTATION, &orientation);
    orientation = newValue;
    TIFFSetField(infile, TIFFTAG_ORIENTATION, orientation);
    if (!TIFFWriteDirectory(outfile)) {
      printf("Error!");
      (void) TIFFClose(outfile);
      (void) TIFFClose(infile);
      exit (-2);
    }
  } while(TIFFReadDirectory(infile));
  TIFFClose(infile);
  TIFFClose(outfile);

Many thanks in advance for any help you can provide me with!

*Bradley