I recently finished a Python library I was working on, to manipulate/convert PSP files. It's currently in alpha, seems to work for me, but I'm sure there's bugs. Also has a fair number of constraints - for instance, you have to File->Save-As version X, since that's the last version I can find documentation on. Also, Layers have to be saved uncompressed, haven't yet implemented LZ77 decompression.
Its main function is format-conversion - for instance, taking a PSP file with a transparency-layer, and saving as a PNG file that has an Alpha channel with the transparency. It can be used either on the command line, or as a Python API - the API is more complex to use (and requires Python coding), but has more capabilities than the command-line.
Basic command-line usage would be something like:
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psp_scan some_file.pspimage -m 3 # output - somefile.pngIt's published on PyPi, so it can be installed with pip:
https://pypi.python.org/pypi/psp-scan
Wiki page with install/usage documentation:
https://github.com/CrawfishPress/psp_scan/wiki
It requires that Pillow be installed. This isn't hard, but one minor issue I had on some versions of Windows, was installing zlib. (If that's a problem for people, I can change the package's version requirements to Pillow==2.9.0, which doesn't require zlib).
Note: this is a standalone Python library, not related to PSP's scripting.
Looking forward to the brutal feedback. (okay, not really, however any feedback is appreciated).
Comments/questions can be left here, or my email address in my profile.
John C>