How to analyse signal chain? I have green, I want purple!

Having seen quite a few people posting their signal chain screenshots, I’m curious as to exactly how the ‘quality’ colours are derived….

I got the colours from another topic

So I figured that once downsamplg or re-sampling had occurred, the signal chain from that point forward would no longer be bit perfect (compared to the source), but often it returns to purple again towards the end, like this example:

Perhaps I’m misunderstanding (not unheard of :grin:), but once something’s been made ‘non’-bitperfect, how can it go back?