||
>> [X,R]=geotiffread('mydclip1.tif');
>> info = geotiffinfo('mydclip1.tif');
>> a=find(X==0);
>> X(a)=255;
>> geotiffwrite('mydclip_zll.tif',X,R, 'GeoKeyDirectoryTag', info.GeoTIFFTags.GeoKeyDirectoryTag);
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