This is possibly an odd case, but I would certainly appreciate any help.
I prepare an ARGFILE, in utf-8, with XMP tags like -xmp-dc:title=. Exiftool writes the data correctly to jpegs.
I then (1) change the tags to the corresponding IPTC ones, e.g. -xmp-dc:title= to -iptc:ObjectName=, and (2) use iconv to convert the ARGFILE encoding from utf-8 to iso-8859-7 (Greek), as most programs do not read utf-8 IPTC. The resulting file is read correctly by text editors.
However, when exiftool tries to write the data to jpegs it returns "Warning: Malformed UTF-8 character(s)". The cause seems to be the Greek characters.
Both exiftool and iconv are well established, so perhaps I do something out of place. But if not, is there a way exiftool can accept the iconv output? Or is there another standard encoding conversion tool that exiftool is happy with?
Many thanks in advance,