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[Michał Sawicz <michal.sawicz@xxxxxxxxxxxxx>]

** No longer affects: unity8

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https://bugs.launchpad.net/bugs/1267279

Title:
  [greeter] Infographic highlight colors not ideal for different
  backgrounds

Status in Ubuntu UX bugs:
  Won't Fix
Status in “unity8” package in Ubuntu:
  Incomplete

Bug description:
  While the selected shades of orange and purple look good on the
  default wallpaper, and on other purple wallpapers, they don't look
  good on green, blue, etc wallpapers.

  Proposed solution:

  * Provide a mapping keyed on different color hues (red, orange, yellow, etc) that contains two sets of "highlight" colors for each hue:
    * 3 shades for the same hue
    * 3 shades of a different hue

  * When the wallpaper for the welcome screen is set, find the "average" color like we do on the desktop, and best-match that to the hue keys in the map.
   * Of the 6 defined shades, remove the one that is closest to the wallpaper "average" in hue (this will avoid having a highlight that is too similar to the background)

  * Use the remaining 5 hues, alternating, starting with one from the
  "different hue" set (the set with 3 remaining after dropping one)

  Expected result:

  On the default wallpaper, which has a purple "average" color, the
  infographics would have 3 shades of orange and 2 shades of purple.

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