Comment 15 for bug 979208

> Kryo Stat wrote:
>> Do you think it would be possible to include Brightness-Contrast and Color
>> Levels/Curves in this module since this all deals with color adjustments ?

Attaching another extended variant of the extension (experimental!), with additional tabs 'Brightness' and 'Contrast':
- adjustable 'Brightness' is based on the 'Brighter/Darker' modules of the Color extensions
- adjustable 'Contrast' (experimental) is based on a rather randomly picked resource from the web, which produced plausible results with simple test cases:
  <http://www.dfstudios.co.uk/articles/image-processing-algorithms-part-5/>