Why antialiasing do not working for QML Image?

[svv]

Hello!

This is my code:

import QtQuick 2.6
import QtQuick.Window 2.2
 
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
 
    Rectangle {
        id: r0
        anchors.fill: parent
        color: "Black"
 
        Image {
            id: bi
            source: "qrc:///3.png"
            anchors.centerIn: parent
            visible: true
            antialiasing: true
        }
    }
}

import QtQuick 2.6
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Rectangle {
        id: r0
        anchors.fill: parent
        color: "Black"

        Image {
            id: bi
            source: "qrc:///3.png"
            anchors.centerIn: parent
            visible: true
            antialiasing: true
        }
    }
}

To copy to clipboard, switch view to plain text mode 

I set antialiasing to true, but my .png on screen has a raggy boundary. Antialiasing do not working! Why?

My .png:
3.png

On screen:
result.png