Nice to see Picsel getting the attention they deserve.
I worked briefly for AP as it was then known for its ImageFS2 product. Dr. Majid Anwar and Graham Borland were doing things with graphics on a SA RiscPC that was amazing to see. Realtime moving, rotation, clipping and transparency control of two overlayed hi-res bitmap graphics in realtime.
I remember them asking Computer Concepts if they'd like to license it for putting it into Impression, no vision CC.
AP even came to a Acorn show or two to display it. But I suspect few people saw their software in action.
Just goes to show you that hand made assembler code is still King.