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//! [0]
	pixmap = QPixmap(100, 100)
	pixmap.fill(Qt.transparent)

	gradient = QRadialGradient(50, 50, 50, 50, 50)
	gradient.setColorAt(0, QColor.fromRgbF(1, 0, 0, 1))
	gradient.setColorAt(1, QColor.fromRgbF(0, 0, 0, 0))
	painter = QPainter(pixmap)
	painter.fillRect(0, 0, 100, 100, gradient)

	channelImage = pixmap.alphaChannel()
	update()
//! [0]