https://bugs.kde.org/show_bug.cgi?id=397346

--- Comment #3 from Alex <ene...@gmail.com> ---
Created attachment 114994
  --> https://bugs.kde.org/attachment.cgi?id=114994&action=edit
color-to-alpha sample kra file updated

I've updated file to cover full range and left some white and black bar
visible. I've also added reversed gradient from white to black (not from
transparent to white as previous one) just in case.

I think bug is this 100 value, that's limiting effect for black and is "enough"
for white. If you pick grey that you get from left sample you will get exact
100, like effect is limited to only 100.

Reversed situation is visible on right gradient: if you use only 100 value you
remove all of white (logic tells me you should put 255 to get all of white
removed).

Question here now: why you can remove all of white with only 100 value set and
only get grey value of 100 trying to remove all of black (0 value)? Why you
can't remove all of white and get black?

For me it's like scale of slider is set in values 0-255 and effect is in
percent 0-100 or something like this.

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