Color.Brightness can’t deal with Image.Pixels output " colors "

I try to apply this lesson ( https://www.youtube.com/watch?v=xlmtZV0dkD0 ) but Color.Brightness can’t deal with Image.Pixels output " colors " as in the tutorial.

Can you modify your posts title so that its more descriptive?

Edited , sorry for bad English.

Feed Image.Pixels with single value, not list

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