Signal Icons a bit dim?

[Zaanzabar]

Describe the bug
So, I noticed that all the signal icons in your most Wonderful pack seem a bit ... dim. I tried some basic color adjustments in the files as detailed in the FAQ, but nothing seems to change the icon brightness. Or is it just me? I'm not very experienced with modding.

I included a wider screen shot, because a light colored environment makes it even more pronounced. You can especially see the difference with the icons in the middle, that are not from your mod.

How to reproduce
Steps to reproduce the behaviour:

1. Open any interface that you can select signals from

Screenshots

Mod list
True with no other mods installed except space-age, elevated rails, and quality.

[Zaanzabar]

I think I fixed it.

All I did was go into
Dectorio_0.13.1\prototypes\signal\signals.lua
and change 2 occurances of
icon = "__base__/graphics/icons/signal/signal_grey.png"
with
icon = "__base__/graphics/icons/signal/signal_white.png"

Thoughts? thought you might want to know.