how to fill color to the png image file's Alpha channel

[xiongxiongchuan]

i am using QBrush filled with
Qt::TexturePattern to draw QGraphicsItem and i want to to fill color to the png image file's Alpha channel with custorm color at runtime.
and i want to know if there is other way to slove this problem without png format picture format/

[anda_skoa]

How does your drawing code look like?
Which kind of paint device are you drawing on?

Cheers,
_

[xiongxiongchuan]

i use the code like this

QBrush *brush=new QBrush(":/images/12.png");