替换 GPS 标签值 [编辑 EXIF]

Question

我正在尝试删除标签以便能够使用更正后的值重新添加它。有问题的 exif 标签是：GPSImgDirection 但它似乎没有保存新值（我猜它不是 removing/finding 标签）

我到底做错了什么？我一直在尝试遵循 apache (WriteExifMetadataExample.java) 中的示例文件。

P.S。我在Rational值中设置了常量值来简化代码示例...

public static void setBearing(File f, Double bearing)
    throws IOException, ImageReadException, ImageWriteException{

    try (FileOutputStream fos = new FileOutputStream(f.getParent()+ File.separator+"SUPERTMPDUMP12324231.jpg",false);
            OutputStream os = new BufferedOutputStream(fos);) {

        TiffOutputSet outputSet = null;

        final ImageMetadata metadata = Imaging.getMetadata(new File(f.getAbsolutePath()));
        final JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
        if (null != jpegMetadata) {
            final TiffImageMetadata exif = jpegMetadata.getExif();

            if (null != exif) {
                outputSet = exif.getOutputSet();
            }
        }

        if (null == outputSet) {
            outputSet = new TiffOutputSet();
        }

        Rational r = new Rational(bearing);    
        final TiffOutputDirectory exifDirectory = outputSet.getOrCreateExifDirectory();

        exifDirectory.removeField(GpsTagConstants.GPS_TAG_GPS_IMG_DIRECTION );
        exifDirectory.add(GpsTagConstants.GPS_TAG_GPS_IMG_DIRECTION, new RationalNumber(454349, 10000));


        new ExifRewriter().updateExifMetadataLossless(f, os,
                outputSet);
        //Replace file with new meta data
        Files.move(Paths.get(f.getPath()+ File.separator+"SUPERTMPDUMP12324231.jpg"), Paths.get(f.getAbsolutePath()), StandardCopyOption.REPLACE_EXISTING);
    }

}

Answer 1

找到问题，因为它在 "GPS" 目录中，我需要：

final TiffOutputDirectory exifDirectory = outputSet.getOrCreateGPSDirectory();

而不是

final TiffOutputDirectory exifDirectory = outputSet.getOrCreateExifDirectory();

替换 GPS 标签值 [编辑 EXIF]

Replacing GPS Tag values [Editing EXIF]

java

jpeg

exif

metadata