Talk:Contrast Blending

errors from convert

This is basicly working but conver prints out error messages:

[0]jom@dapperdrake:~/HDRI/# ./contrast_blending.sh n.jpg u.jpg o.jpg 
+ normal=n.jpg
+ under=u.jpg
+ over=o.jpg
+ convert -type Grayscale u.jpg _mask.tif
convert: _mask.tif: Unknown pseudo-tag 65537. `TIFFSetField'.
+ composite -compose CopyOpacity _mask.tif u.jpg _under_masked.tif
composite: _under_masked.tif: Unknown pseudo-tag 65537. `TIFFSetField'.
+ composite -compose Darken _under_masked.tif n.jpg _composite.tif
composite: _composite.tif: Unknown pseudo-tag 65537. `TIFFSetField'.
+ convert -negate -type Grayscale o.jpg _mask.tif
convert: _mask.tif: Unknown pseudo-tag 65537. `TIFFSetField'.
+ composite -compose CopyOpacity _mask.tif o.jpg _over_masked.tif
composite: _over_masked.tif: Unknown pseudo-tag 65537. `TIFFSetField'.
+ composite -compose Lighten _over_masked.tif _composite.tif merged.tif
composite: merged.tif: Unknown pseudo-tag 65537. `TIFFSetField'.

Any idea how to get rid of the error message ( except > /dev/null 2>&1 )