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Hi Paul_MR,

I really appreciate the starting reference - it is more than I could have asked for. I will take quite a while to go over all of this and see if I can produce something more comprehensive.

As an aside, I have been using one of the few python file parsers to try to input some small extra data to a specific layer. For example this one: https://psd-tools.readthedocs.io/en/latest/ While doing more research into this, I have found that there seems to be a 'layer_id' tagged block to use (key "lyid"). As the metadata I needed was to store a unique ID anyway, I was wondering if it would be acceptable to write my own ID into this field? So far it seems to work for me but I am not too familiar with PSD internals to know if this might cause some other ill effect down the road.

Thanks very much again, I will definitely be making use of some of your samples!