If you are using iTunes in bright light conditions the iTunes screen could be hard to read. Instead of activating the system wide high contrast mode you can enable this feature only for iTunes. Quit iTunes and use the following command:
defaults write com.apple.iTunes high-contrast-mode-enable -bool TRUE
Restart iTunes and it will be activated in high contrast mode.
Restore to default with:
defaults delete com.apple.iTunes high-contrast-mode-enable