Timeline - Different gray values of exposed cells according to rows


I think that the timeline would become a bit easier to “read” if the gray values of exposed cells could slightly differ between rows:
See example 1

In another feature request I said that I would find useful if blank exposed cells could be displayed in a distinguishable way.
See topic

And here is how the blank cells feature could look like combined with the differing cell gray values feature:
See example 2