事实证明,包含一个 EXIF 标签 ColorSpace=1 就足够了,它告诉它应该被处理为 sRGB。使用 Apache Commons Sanselan 成功地做到了这一点。不幸的是,这个库并不完整,因此它只能在文件创建后用于修改 EXIF。
相关代码,基于 Sanselan 示例:
public void addExifMetadata(File jpegImageFile, File dst)
throws IOException, ImageReadException, ImageWriteException {
OutputStream os = null;
try {
TiffOutputSet outputSet = new TiffOutputSet();
TiffOutputField colorspace = TiffOutputField.create(
TiffConstants.EXIF_TAG_COLOR_SPACE, outputSet.byteOrder, new Integer(1));
TiffOutputDirectory exifDirectory = outputSet.getOrCreateExifDirectory();
exifDirectory.add(colorspace);
os = new FileOutputStream(dst);
os = new BufferedOutputStream(os);
new ExifRewriter().updateExifMetadataLossless(jpegImageFile, os, outputSet);
os.close();
os = null;
} finally {
if (os != null)
try {
os.close();
} catch (IOException e) {
}
}
}