I have a group of shapes that each have their own unique gradient fill. I would like to use the union of those shapes to create an alpha mask for an image behind it.
In other words, I want the union of the alpha mask effects on a bitmap/image.
Things I've tried:
union of the shapes, but I loose the fill information.
flattening shapes to bitmap, but it seems there is no way to mask a bitmap with a bitmap (use as mask is not selectable)?
Here is a screenshot of example shapes I'm talking about: