Input & Output Port Colour
I failed to recognise the ports when using the relevant overlay that are darker in colour, such as coal and carbon dioxide.
Vanilla Port Colours
Have an option in game to revert the port colours to the game default: White for Input and Green for Output.
Using the overlays, there is reduced cases where there are multiple input or output ports for that overlay. Vanilla uses Orange to represent a filtered port, so if there is only one additional port Orange can be used.
Compromises
- Within an overlay, some building's filters accept multiple types of input (Metal Refinery) using one port, while some buildings with multiple outputs (Electrolyzer) have multiple ports. While not as useful, consolidating the inputs and outputs to one port each can remove ambiguity.
Screenshots
I failed to see:
Carbon Dioxide (Gas Range, Coal Generator)

Coal (Coal Generator)

Input & Output Port Colour
I failed to recognise the ports when using the relevant overlay that are darker in colour, such as coal and carbon dioxide.
Vanilla Port Colours
Have an option in game to revert the port colours to the game default: White for Input and Green for Output.
Using the overlays, there is reduced cases where there are multiple input or output ports for that overlay. Vanilla uses Orange to represent a filtered port, so if there is only one additional port Orange can be used.
Compromises
Screenshots
I failed to see:
Carbon Dioxide (Gas Range, Coal Generator)
Coal (Coal Generator)