Qt-interest Archive, August 2006
Q4 QPainter - drawing a pixmap, ignoring the alpha channel
Message 1 in thread
I have a QImage with an embedded alpha channel. When the embedded alpha
channel contains all black, and I convert it to a QPixmap for display,
nothing is drawn when I paint the pixmap.
Is there a way to paint the image/pixmap with the painter ignoring the
alpha channel? I just want it to render the RGB channels, and assume
alpha is opaque.
--
[ signature omitted ]
Message 2 in thread
Paul Miller wrote:
> I have a QImage with an embedded alpha channel. When the embedded alpha
> channel contains all black, and I convert it to a QPixmap for display,
> nothing is drawn when I paint the pixmap.
>
> Is there a way to paint the image/pixmap with the painter ignoring the
> alpha channel? I just want it to render the RGB channels, and assume
> alpha is opaque.
You could use QImage::convertToFormat(QImage::Format_RGB32) to obtain a
new image without the alpha channel.
--
[ signature omitted ]
