The solution here seems to be to only apply dithering to the two
blueish-areas where the 8-bit colour banding is most apparent, these are
the top left and middle bottom.  This avoids applying noise to the whole
image, whilst still solving the visible problem.
Otto: do we the vector-ise original 12-bit or 16-bit colour depth that
we can work from?

** Description changed:

  Following on from bug #833990 for Ubuntu 11.10.
  
  Subtle adjustments that follow in line with the previous two releases,
  as quoted below:
  
  'I have made subtle changes and introduced new light refractions. We can
  continue to add light streams and re-balance with each release - the
  landscape becomes gently lighter and brighter and gains in complexity to
  reflect our drive towards 12.04 :)
  
  IMHO as we move towards becoming more of a 'household' platform and with
  the great changes coming with Unity (launcher/dash) general users will
  get reassurance from the familiarity of the wallpaper and will also
  identify with it as part of our personality in new screenshots.
  
  This time I have re-balanced rather than just adding additional light
  streams and have introduced more warmth - it's the LTS after all ;)
  Included are two versions, the difference being
  'new_wallpaper_final_full_size_noise02a.jpg' has noise added to
  counteract posterisation in the blends but it is a much larger file - I
  would of course prefer to use this one if at all possible.
  
  Despite the fact that these files are named
  'new_wallpaper_final_full_size02a.jpg' and
  'new_wallpaper_final_full_size_noise02a.jpg' please rename the final
  selection to 'warty-final-ubuntu.png' to be registered as the default
  wallpaper.
+ 
+ See also bug #933562 (12.04 LTS community wallpapers), which should
+ ideally go up in the same upload.

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https://bugs.launchpad.net/bugs/968399

Title:
  Incremental tweaks to default wallpaper for Ubuntu 12.04 LTS

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