!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.
Download Version 0.05 (11.12.2017) as zipfile (20k).
Last update: 11.12.2017
[RISC OS] [Software]