"not very easily" is even an understatement...
I found that those filename colors are determined by: [id="Controls.InputControl.Disabled"]
This is an element for text and items you actually don't want/need to see clearly to show they're disabled, which is shared in some other settings panels.
Maybe Steven can change this sometime?
I think I found a good compromise anyway. I uploaded the updated version.
Let me know if this works o.k. for you too.
While at it, the text color of the 'original titles' are determined by [id="Controls.InputControl.Modified"], which I think is also not quite appropriate.
jistme, I've just noticed another little problem. Open up the auto album tagger, some of the fields like original filename can't be seen very easily.