Thanks for the reply Jonas & Yost Group.
I have found various packages available to perform "Blue screening" on
animations.
If I wanted to create a screen saver in windows with random animations
appearing over a bitmap with transparency I would need WIN G and a library of
C++ functions called "Labplay" by Media!LAB. They have a demo of this program
in the MS WINDOWS MULTIMEDIA forum.
I had seen this blue screening effect before. I just wanted to know how, what
and where.
Thanks
Geoff Coope