Font Colours using custom Background image Options

[I3looM]

Hi all,

I've made a custom background png file that I would like to use instead of the default white base image. When I use this it changes the colours of the fonts. Its almost like the font values are relative to the background colours somehow. what do I need to change so that font colour values I use in $config['font_color'] and $config['font_colormono'] are the actual colours that I see regardless of background image.

Thanks