Limitation on tag lenght

[Gilles Caulier]

The string size limitation is not 64 bytes in IPTC tags, some are 32,
128, or 256, etc.

Look on the IPTC tags list from Exiftool :

https://exiftool.org/TagNames/IPTC.html

Size is indicated in the Writable column when type is string.

Best

Gilles Caulier

Le mar. 19 mars 2024 à 10:50, Milind Joshi <mmjoshi at iitbombay.org> a écrit :
>
>
> On 19.03.2024 12:31:28 pm, Gilles Caulier wrote:
>
> In the Metadata Editor plugin for digiKam and Showfoto, the IPTC tab
> contents has all explanations given in tool-tips about string size
> limitations.
>
> https://imgur.com/a/dOu8ND0
>
> Checked. The limitation is 64 characters. Interestingly, it does allow the input of more than 64 characters with the characters remaining counter going negative. Don't know how that is handled. Also, the side note mentions that IPTC tags have size limitations and advises to use xmp instead. Most of my images have the tag information stored in IPTC tags. Is there any way I can bulk move all IPTC:Keywords data to xmp? Is it really necessary, especially if I can live with the 64 character limitation for tags?
>
> Is there a simple way to find out which of my tags are exceeding this limit as I am sure there are some? If I can locate them I can truncate them to fit the size limitation.