TIFFReadDirectory当使用QPixmap :: load（）读取GeoTiff时发出警告

Question

我有一个geotiff文件，我正在用QPixmap :: load（）加载到QPixmap中。我多次向控制台显示以下警告。然而，直接使用libtiff会在没有警告的情况下打开它。

有关如何减轻QT中这些难看警告的想法？

TIFFReadDirectory: Warning, foo: unknown field with tag 33550 (0x830e) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 33922 (0x8482) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 34735 (0x87af) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 34736 (0x87b0) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 34737 (0x87b1) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 33550 (0x830e) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 33922 (0x8482) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 34735 (0x87af) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 34736 (0x87b0) encountered. 
TIFFReadDirectory: Warning, foo: unknown field with tag 34737 (0x87b1) encountered. 

谢谢！

Answer 1

这些都是可以用的libtiff库中定义的自定义标签：
http://www.remotesensing.org/libtiff/addingtags.html

他们可能EXIF标签：
http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif.html

这些都是已知的标签的libtiff：
http://trac.imagemagick.org/browser/tiff/trunk/libtiff/tiff.h#L148

由于新的定义包括类型和数量，您可能会猜到，这些标签的含义。您也可以运行exiftool来检查未知的TIFF标签：
$ exiftool -htmldump sample.tif> /tmp/dump.html; firefox /tmp/dump.html