Qt 5.9 | Qt Graphical Effects | QML Types | Desaturate QML Type

Qt 5.9.2 Reference Documentation

# Desaturate QML Type

Reduces the saturation of the colors. More...

Import Statement: | import QtGraphicalEffects 1.0
Since: | QtGraphicalEffects 1.0

- List of all members, including inherited members

## Properties

- cached : bool
- desaturation : real
- source : variant

## Detailed Description

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

Source | Effect applied
--- | ---

Note: This effect is available when running with OpenGL.

## Example

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
          }
      }

## Property Documentation

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.

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