内容

• 特性
• 详细描述
• 范例

Desaturate QML Type

Reduces the saturation of the colors. 更多...

import 语句：	import QtGraphicalEffects 1.0
Since:	QtGraphicalEffects 1.0
继承：	Item

• 所有成员列表，包括继承成员

特性

• cached : bool
• desaturation : real
• source : variant

详细描述

Desaturated pixel values are calculated as averages of the original RGB component values of the source item.

源	Effect applied

注意： This effect is available when running with OpenGL.

范例

The following example shows how to apply the effect.

import QtQuick 2.0
import QtGraphicalEffects 1.0
Item {
    width: 300
    height: 300
    Image {
        id: bug
        source: "images/bug.jpg"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
    }
    Desaturate {
        anchors.fill: bug
        source: bug
        desaturation: 0.8
    }
}
					

特性文档编制

cached : bool

This property allows the effect output pixels to be cached in order to improve the rendering performance.

Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.

It is recommended to disable the cache when the source or the effect properties are animated.

By default, the property is set to false .

desaturation : real

This property defines how much the source colors are desaturated.

The value ranges from 0.0 (no change) to 1.0 (desaturated). By default, the property is set to 0.0 (no change).

Output examples with different desaturation values
desaturation: 0.0	desaturation: 0.5	desaturation: 1.0

source : variant

This property defines the source item that provides the source pixels to the effect.

注意： It is not supported to let the effect include itself, for instance by setting source to the effect's parent.