When a sign is placed in a NORTH or SOUTH direction and there is coloured text on it, the text is darkened making it look bad! But if you place the sign in a EAST or WEST direction the text is perfectly fine. See pictures for more detail! (On Singleplayer and Multiplayer!)
By the way, there was a post about this made about 1-2 years ago but never got an answer, I hope you give this a look into. 🙂
Thanks
-Chin
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-33304. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.