Null ASCII value

[ltdan]

I'm trying to resize an image (tiff file) but I get the following error :

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ASCII value for tag "Copyright" contains null byte 
in value; value incorrectly truncated during reading due to implementation 
limitations. `TIFFFetchNormalTag' @ warning/tiff.c/TIFFWarnings/824.

When I open it in Gimp I also get the same error. How can I edit this so its not null or is there some other core reason for this?

[snibgo]

It's just a warning. "-quiet" will turn off warnings. Or you can convert it to another file:

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convert in.tiff out.tiff

Then work with out.tiff.