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Good Evening All,

This is my first post here. I am a very well versed python programmer, but not quite as competent in photoshop (yet). I am looking to batch read/write basic metadata (a ~5-25 character string, for example) to either

1) a photoshop file

2) a specific layer in a photoshop file

Ideally, this metadata string would not be visible when opening the layer / file in the program, but if it is and is not too obtrusive  or easy to edit/overwrite accidentally, that is fine. From what I gather from the specification, this should be possible. I have first tried to do it with tagged blocks using the 'psd-tools' library, but I can not seem to find a layer-writing function approach that does not product an error when opening the file in PS. I am also fine with creating my own parser for the photoshop file or using some kind of built in batch mode / cmdline call if it exists.

If anyone has any general pointers or keywords to look for to start to accomplish this, please let me know if you have a chance!

Thanks for reading