Easy way of highlighting area

[Johannes Bauer]

Hello list,

I've done this a couple of times already, but never found a way to
*easily* do it in kdenlive: I want to darken most of the image except
for one area (arbitrary shape, preferrably) of which I want to keep the
brightness the same.

Ideally, I'd want to use either a PNG or (even more convenient) title
clip as a matte for the "brightness" effect. Is this possible?

Thank you so much,
Best regards,
Johannes