Login screen does not look good when using light wallpapers

[Mo-Yu Mandy Zhou]

The login screen (LightDM) looks great for darker wallpapers, but when I use a lighter wallpaper, two things happen:

1) The white text (for the Ubuntu logo and the other users' names) becomes difficult to read.
2) The computer name on the top left turns gray.

The vast majority of the login screen thus becomes quite hard to read when using a light wallpaper.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity-greeter 0.2.8-0ubuntu1.2
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
Date: Mon Aug 27 16:40:37 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-greeter
UpgradeStatus: Upgraded to precise on 2012-04-28 (121 days ago)
modified.conffile..etc.lightdm.unity.greeter.conf: [modified]
mtime.conffile..etc.lightdm.unity.greeter.conf: 2011-11-06T12:20:46.416589

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.