I try to do a fade out across white (melted with the white) in YUV mode.

Tutoriel 49jColorspaces allow me to understand I can achieve my goal with U & V channels set to greyscale, then increase brightness for the Y one.

... but I have to many ways and objects to explore for that !

I didn't already run the tutorial 43 "Your very own slab"

I try to do a fade out across white (melted with the white) in YUV mode.
Tutoriel 49jColorspaces allow me to understand I can achieve my goal with U & V channels set to greyscale, then increase brightness for the Y one.

I didn't already run the tutorial 43 "Your very own slab"
Would I absolutely have to for that ? 

I just want to do a simple task.
What is the best for me ?

@colormode uyvy : how to create a fade ?