[Scribus] can't colorize picture

[dwinti]

Hello,

as newbie on scribus i had the following problem.
For a flyer i used several grayscale images that i want to colourize in
a clear blue colour.

This colour didn't existe so i created it myself. But when i try to
colourize my image with this colour i just get a white image. When i use
a colour provided by scribus it works very fine.

So why couldn't i use my self defined colour with this colour change
function??

any Ideas?

Daniel