Thank you for reply Mr? bpb.
To modify the image metadata you can either apply the mergeTree() approach likeused here
but in this case on the native TIFF image metadata, or you could use theTIFFDirectory >approach described here
These advice was very very useful !!
I solved modify Metadata by using TIFFDirectory.removeTIFFField(int tagNumber)and TIFFDirectory.addTIFFField(TIFFField f).
Thank you very much !.
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