QImage, PNG ad Transparency

[Rebe]

Hi!

I'm new to the forum and quite new to the Qt Programming.

I've a problem with QImage.
I need to draw an image (.png) with transparency.
I've serched and read a lot of thread on this forum, but I did'nt found any solution.

This is the code I used to load the image:

imm=QImage(53,48,QImage::Format_ARGB32_Premultiplied);
immGL=QImage(53,48,QImage::Format_ARGB32_Premultiplied);
 
imm.load("image.png", "PNG");
immGL = QGLWidget::convertToGLFormat(imm);

imm=QImage(53,48,QImage::Format_ARGB32_Premultiplied);
immGL=QImage(53,48,QImage::Format_ARGB32_Premultiplied);

imm.load("image.png", "PNG");
immGL = QGLWidget::convertToGLFormat(imm);

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This is the code to draw the image:

glRasterPos2i(x0,y0);
glDrawPixels(w, h, GL_RGBA, GL_UNSIGNED_BYTE, immGL.bits());

glRasterPos2i(x0,y0);
glDrawPixels(w, h, GL_RGBA, GL_UNSIGNED_BYTE, immGL.bits());

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As a result, the image is drawn with all pixel that should be transparent converted to black.

Any solutions?

Thanks in advance,
Rebe