QImage image.save is different from the QPainter.drawImage(image)

lygstate

I have a image that generate from QOpenGLFramebufferObject::toImage()
And the image that I saved to hard driver
static int count = 0;
image.save(QStringLiteral("%0.bmp").arg(count++));
is different from the image the I use QPainter paint to the screen.
So what's happening?
The image that saved to hard driver:

The Image the was drawn to screen:

SGaist

Hi,

How do you setup the painter ? Are you doing the any customization of the painter ?

lygstate

None, I have none customize.

QPainter(this)
this is a simple pure QWidget.

lygstate

But I found the solution,
The QImage have invalid Alpha channels, I clean them up.
And it's works now.

SGaist

Glad you found out and thanks for sharing !

Since you have it working now, please mark the thread a solved using the "Topic Tools" button so that other forum users may know a solution has been found :)