https://bugs.kde.org/show_bug.cgi?id=391268

wolthera <griffinval...@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |CONFIRMED
                 CC|                            |griffinval...@gmail.com

--- Comment #1 from wolthera <griffinval...@gmail.com> ---
Caused by the colorsmudge fix after the first beta.

>From what I gather, the problem is on ln 282 in the composite there. You see,
transparency masks are alpha colorspaces. I think it's confused on how to
handle this alpha color space, because there black is transparent! So it just
goes, well, this is transparent, let's not do anything :p

Some qdebugs show this quite clearly:

With darkgray:
Color                   "Alpha 63335"
dulling                 "Alpha 46893"
dulling after composite "Alpha 47741"

with black
Color                   "Alpha 0"
dulling                 "Alpha 65535"
dulling after composite "Alpha 65535"

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