I have a QImage (m_sourceImage) set with the Grayscale16 format.
I want this image to be converted to a QSGTexture object to use it inside a QSGSimpleTextureNode.

I tried to simply convert it with the following function: QQuickWindow::createTextureFromImage

// customItem.h

class OP_ImageViewer : public QQuickItem
{
    OP_ImageViewer(QQuickItem *parent = nullptr) {setFlag(ItemHasContents, true);}

    void setSourceImage(QImage i) {m_sourceImage = i;}

protected:
    QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *) override;

private:
    QImage m_sourceImage; // set outside the class
}


// customItem.cpp
QSGNode *customItem::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
    QSGSimpleTextureNode* node = nullptr;
    if(oldNode == nullptr)
        InitializeNewNode(node); // create instance inside the given pointer
    else
        node = static_cast<QSGSimpleTextureNode*>(oldNode);

    // update geometry

    // set the texture to the node instance.
    oldNode->setTexture(window()->createTextureFromImage(m_sourceImage, QQuickWindow::TextureIsOpaque)); 
    // convert the image but truncate to 8 bit even if the image is a 16bit color format.
}

and this result in showing me the texture inside my custom qml but the pixel colors aren’t as precise as the QImage is.
Is there a method to create a QSGTexture with a 16 bit per color ?