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  • Unpack premultiplied alpha using the command line tool

I now need to unpack from the command line, which is all I see in the help documentation
:
Spine -i <path> -o <path> -c <path>

How do I set it to Premultiplied Alpha?

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The unpacker doesn't have a PMA setting from the CLI, sorry. We'll add it to the list of things to get done in 4.2.

There is this tool, though it doesn't have PMA:
https://github.com/libgdx/libgdx/blob/master/extensions/gdx-tools/src/com/badlogic/gdx/tools/texturepacker/TextureUnpacker.java
You'd need to add unpremultiply alpha yourself. This page describes more about it:
https://libgdx.com/wiki/tools/texture-packer

Oh, since 4.1.26-beta of your atlas is in the newer atlas format, it will have pma: true in the atlas file and the unpacker will perform un-PMA. If you have older atlas files, you could probably process them to add the pma: true field.