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TIFF and LibTiff Mail List Archive

Thread

2006.01.24 20:53 "[Tiff] Dead directories after TIFFRewriteDirectory()", by Roland Richter
2006.01.26 14:00 "Re: [Tiff] Dead directories after TIFFRewriteDirectory()", by Frank Warmerdam
2006.01.27 00:18 "Re: [Tiff] Dead directories after TIFFRewriteDirectory()", by Joris
2006.01.28 16:55 "Re: [Tiff] Dead directories after TIFFRewriteDirectory()", by Roland Richter

2006.01.24 20:53 "[Tiff] Dead directories after TIFFRewriteDirectory()", by Roland Richter

All,

in my current project, TIFF files are created in two steps:

Step 1: store a TIFF file containing two pages.

Step 2: add some meta data (i.e. custom tags) to the first

        page, and remove the second one.

For step 2, I use TIFFRewriteDirectory() and TIFFUnlinkDirectory(), and it /seems/ to work... afterwards I have a TIFF file with only one image left, an with the additional tags.

BUT: the file size got *bigger*!

As far as I can tell from the directory offsets, it simply appended the new directoy 1 to the end of the file, and didn't remove directory 2.

So, obviously I've got two "dead" directories within that TIFF:

(old1) (old2) new1

How can I prevent that?

Or, is there a way to "defrag" the TIFF file, i.e. get rid of those dead directories?

Roland