Thanks Kyn, The pps which came in opened with Keynote. (This is normally the case with pps unless I open Power Point first, or request it with the Ctrl key)
The picture quality was clear but not sharp in resolution. ok for its purpose, flowers and countryside, and measuring approx 18cm by 14cm. (no music although it requested sound switched ON)
Since my first note, I remembered that I had taken my pictures straight from iPhoto, so they were in original format of around 1.4 to 2.2mb each which accounts for the size (and excellent resolution) so I tried making a medium quality selecton within iphoto to Mail.
This worked ok and I found when I dragged he pictures from Mail into Keynote I could 'adjust' the picture quality , however, next problem was the frame of Keynote was much larger than the slide which was now approx 13 x 9cms, which was acceptable for my purpose.
Haven't found out yet how to fit the keynote window to the picture. The Inspector not very helpful.
Am sure there must be a neater way of doing this than via iPhoto, and there must be a simple click somewhere to match picture with frame
Open to further advice
Eric