How (and why?) do green vegetables become BRIGHTER when being cooked?

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Plants and grasses mostly seem to wilt and die when exposed to high heat, why is it that green vegetables, when steamed and heated in a pan, turn brighter and seemingly more vibrant?

In: Biology

It’s pretty, right? Broccoli goes from that waxy deep green to bright almost grass like. Heat weakens the plant walls around cells and you can see the chloroplasts better.