This won't be a demonstration of the effect you want but hints at the potential of transitional effects in A:M.
The file was created in v12n+ (I suppose I should update that to v+)
The file may be more confusing than necessarily. I apologize for that.
There are several models that are included that can be swapped out with the IrisInOut_Filter model.
Also I have no decals or patch images in this example but creating transitions with them can be quite useful especially when you might have odd shapes that you want to transition.
The file uses two images (same image actually one color and one grayscale)
Two rotoscopes
The IrisInOut effect using a model made from a 5 point circle extruded out and squared off at the outer edges. Included in the project is another model of the same but with the 5 pointer filled in. Doubt you'd ever need such a thing as a rectangular patch will do the same.
The grayscale rotoscope begins at 0% transparency and ends with 100%
The color rotoscope begins at 100% transparency and ends with 0%
The 5 points on the Iris spline are just dragged in out out with occasional keyframes added.
The top CP in the circle demonstrates that you can adjust the shape of the Iris as you need to by manipuating/animating splines.
So basically this project demonstrates.
- Fading In from light grey to an image
- Fading to Black from an image
- Transitioning from one image to another
- Transitioning from greyscale to color image
- Iris In and Out
... and I dunno what else.
There are millions of things A:M can't do if you give up trying.
QUOTE
With the rotoscope in the chory and the key colour set I still cant get unused area of the Roto to be transparent.
This looks like a hint at your problem.
It sounds like you have an image that doesn't have transparency set up as you'd like it.
Was the image created in A:M with an Alpha Channel/transparency?
If you can share the image and describe what you want maybe we can set you up for success.