Is it possible to mix colors with background not only on the alpha channel?

Question

WPF

Hello.
windows-desktop program (8.1). The program has a translucent window with the opacity property set, so it looks transparent. But sometimes the information from this window almost matches the color of the background and becomes almost invisible. Is there a way to render window transparency not only by alpha/opacity, but some other way of blending colors, like subtract/multiply, so that the information in the window is in contrast with the background below it?
PS
At the moment I'm getting out of the situation by drawing an additional background under the controls:

Answer 1

No way