Try this:-
http://enaysoft.co.uk/parp.zip
What I've done is invertly dither masked your images into 2 seperate frames. Basically if you drew them together, you'd get the full frames again.
But I've made it flicker quickly between them, giving you an odd flickery/blurryish effect. I've flickered half in one frame and half the other so you get a better blurry effect.
Not a real motion blur, but probably the best you'll get using Blitz2D.
The good thing is though, not only are your particles transparent now, so you'll be able to see everything behind the particles, but also there is no extra CPU added, just a slight fraction of memory extra for the extra frame, it'll be no slower than your original algo.
If you want the source code I used to dither mask your image I'll let you have it.
Hope this helps. :)
http://enaysoft.co.uk/parp.zip
What I've done is invertly dither masked your images into 2 seperate frames. Basically if you drew them together, you'd get the full frames again.
But I've made it flicker quickly between them, giving you an odd flickery/blurryish effect. I've flickered half in one frame and half the other so you get a better blurry effect.
Not a real motion blur, but probably the best you'll get using Blitz2D.
The good thing is though, not only are your particles transparent now, so you'll be able to see everything behind the particles, but also there is no extra CPU added, just a slight fraction of memory extra for the extra frame, it'll be no slower than your original algo.
If you want the source code I used to dither mask your image I'll let you have it.
Hope this helps. :)