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 ExtractTiffImageFile / InsertTiffImageFile		  New Topic  Reply to Topic
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swestner

17 Posts
Posted - Nov 07 2012 :  08:31:32  Show Profile  Reply
Hello,

I have a tiff-file with multiple frames. I extract each frame with ExtractTiffImageFile . After extraction I combine the single frames again to one tiff file with InsertTiffImageFile . I change nothing in the tiff-files. I expect that the recombined file would be exact identical to the one I split but it isn't (I build a hash about both to verify it).

If I do a picture-comparison it shows me that the image is the same but the difference lies somewhere in the header / metadata. Why?

Greetings

Stefan

xequte

39066 Posts
Posted - Nov 07 2012 :  17:56:07  Show Profile  Reply
Hi Stefan

Have you compared the header data using the EXIF demo at:

http://www.imageen.com/demos/


Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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swestner

17 Posts
Posted - Nov 08 2012 :  01:18:41  Show Profile  Reply
The picture contains no EXIF data. Optically the both TIFs are the same but binary they are not. Something changed when using ExtractTIFF and InsertTiff.

Fabrizio: could you look at this?

Thanks

Stefan
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fab

1310 Posts
Posted - Nov 08 2012 :  01:29:13  Show Profile  Reply
quote:
I expect that the recombined file would be exact identical to the one I split but it isn't (I build a hash about both to verify it).


There is no guarantee that the headers will be identical. For example order of TIFF tags, byte alignments and other stuff may change.
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