Synfig Animation Studio

draw two overlapping circles
set the top one to be 'straight' blended, with an amount of 0.5

the overlapping region will be opaque, but the other parts of the 2 circles
will be semi-transparent.

point to them, and look at the 'A' field in the 'Info' panel. it shows
100% in one of the two semi-transparent areas.

This patch fixes it (for non-inverted circles):

Index: circle.cpp
===================================================================
--- circle.cpp (revision 2059)
+++ circle.cpp (working copy)
@@ -344,7 +344,7 @@
return
Color::blend(color,context.get_color(point),get_amount(),get_blend_method()
);
}
else
- return context.get_color(point);
+ return
Color::blend(Color::alpha(),context.get_color(point),get_amount(),get_blend
_method());
}

//inside the circle's solid area (with feathering)


but the same problem exists for many other layer types too.