Hi List! I'm working on an Android app, where I want to read and write "EXIF tags" to JPEG files on the device. Sanselan 0.97 seems to work perfectly, although it's a bit complicated to work with EXIF tags/directories.
The specific tags I'm interested in, is EXIF_TAG_USER_COMMENT and EXIF_TAG_IMAGE_DESCRIPTION. According to the documentation I could find, UserComment is of field type "undefined", whereas ImageDescription is of field type ASCII. http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif/usercomment.html http://www.awaresystems.be/imaging/tiff/tifftags/imagedescription.html What's the proper way of creating those tags, wrt. charset etc? I want as wide as possible character support (æøå etc). I find different discussions online, with different advice. Seems two constructors are going around, where the simpler one does not deal with charset/encoding at all. This one uses the .create method: String textToSet = "Some Text æøå"; TiffOutputField exif_comment = TiffOutputField.create( TiffConstants.EXIF_TAG_USER_COMMENT, outputSet.byteOrder, textToSet); while this one uses the standard constructor: byte b[] = ExifTagConstants.EXIF_TAG_USER_COMMENT.encodeValue( TiffFieldTypeConstants.FIELD_TYPE_ASCII, textToSet, outputSet.byteOrder ); // constructor arguments: taginfo tag fieldtype count bytes TiffOutputField exif_comment2 = new TiffOutputField(TiffConstants.EXIF_TAG_USER_COMMENT.tag, TiffConstants.EXIF_TAG_USER_COMMENT, TiffFieldTypeConstants.FIELD_TYPE_UNDEFINED, b.length, b); In this last one, the string to set has been converted to a byte array first. But can/should I set the encoding anywhere? Is the field type even ASCII? This information seems to indicate it's not ASCII... http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif/usercomment.html Need some help here, as you can see, to get this right. The second approach above does seem to work in my app, but I'd like to be sure I'm not somehow messing up the JPEGs on the deviced. Joakim
