D28134: Add ColorUtils

[Carson Black]

cblack added a comment.


  In D28134#632087 <https://phabricator.kde.org/D28134#632087>, @davidedmundson wrote:
  
  > What's your intended usecase?
  
  
  Generating UI colours from images, icons, etc. and then applying transformations on them to make them more usable.
  
  Examples:
  
  - PlaMo's splash screen uses something like this to generate a splash colour background
  - Plasma BigScreen cards also uses something like this to generate card backgrounds
  - Ikona could use this to determine what background and foreground to use for displaying icons from various icon themes at sufficient contrast

REPOSITORY
  R169 Kirigami

REVISION DETAIL
  https://phabricator.kde.org/D28134

To: cblack, #plasma, mart, davidedmundson
Cc: davidedmundson, plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, ahiemstra, mart
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