View Y-channel only?

[ChiDragon]

I've got a YUY2 clip and want to view only the luma Y channel. I know about UtoY() and VtoY() for colour, but for the life of me can't find the function to just view Y, if it exists.

Would just desaturating it produce the desired output?

[ajp_anton]

greyscale

[ChiDragon]

I had thought about that but wasn't sure it was correct. Reading the help file I see that it does do exactly what I want for YCbCr formats. Thanks for the quick answer!