Particularly, I'd like to avoid Warning: [Minor] IPTC:ProgramVersion exceeds length limit errors and like messages when writing tags.
Upside: Quite a few versions/years back, I had to change a tag I regularly used with exiv2 because it had an ampersand (&) right in the middle. I tried the same tag on a JPEG file about five minutes ago, and it "took," i.e., the amp wasn't dropped neither was whitespace inserted in its place.
But back on the original topic. Is there anyplace I can find what the length limits of certain tags are? Like ProgramVersion, just to use one example.
Carver
Quote from: L_Carver on March 02, 2017, 01:26:45 AMIs there anyplace I can find what the length limits of certain tags are? Like ProgramVersion, just to use one example.
Check under the various tag groups pages (http://www.exiftool.org/TagNames/) but I think you'll mostly have this problem with IPTC data (http://www.exiftool.org/TagNames/IPTC.html). Make sure you read the info on the IPTC page. You can override the line limitations with the
-m option but it is possible to run into problems with programs that can't deal with the changes.
You could also look into using XMP tags, which don't have a length limitation AFAIK.