How to make a particular area of qml view transparent

[SoyFlutter]

There is a qml file like this:

Item {
width: 800
height: 600

Image {
    id: background
    width: 800
    height: 600
    source: "qrc:/resorces/background.png"
}

Rectangle {
    id: transframe
    x: 500
    y: 200
    width: 200
    height: 100
}

}

How to make the area of transframe transparent, then I can see the grafic under background.

[ODБOï]

hello @SoyFlutter, this can help you http://ebanshi.cc/questions/4494981/need-to-change-color-of-an-svg-image-in-qml

[SoyFlutter]

I asked the same question in another place, and got the answer.
The link is https://stackoverflow.com/questions/47864841/how-to-make-a-particular-area-of-qml-view-transparent