!PhShpLyrs let you extract layers and the full image as sprite including transpareny from Photoshop PSD files.
As a side effekt this let you create new RISC OS 5.21 ABGR sprites with a full alpha channel.

New in version 0.05: Export all layers as directory or DrawFile

You need RISC OS 5 and a lot of memory.

Version 0.05 (11.12.2017) as zipfile (20k).

Last update: 21.06.2019
[RISC OS] [Software]