Grayscale.qml Example File

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import QtQuick 1.0
import Qt.labs.shaders 1.0
Item {
    id: main
    anchors.fill: parent
    GrayscaleEffect {
        id: layer
        anchors.fill: parent
        source: ShaderEffectSource {
            sourceItem: Image { source: "images/desaturate.jpg" }
            live: false
            hideSource: true
        }
        SequentialAnimation on ratio {
            id: ratioAnimation
            running: true
            loops: Animation.Infinite
            NumberAnimation {
                easing.type: Easing.Linear
                to: 0.0
                duration: 1500
            }
            PauseAnimation { duration: 1000 }
            NumberAnimation {
                easing.type: Easing.Linear
                to: 1.0
                duration: 1500
            }
            PauseAnimation { duration: 1000 }
        }
    }
}