HueSaturation QML Type | Qt Graphical Effects 5.9

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

Qt 5.9.3 Reference Documentation

# HueSaturation QML Type

Alters the source item colors in the HSL color space. More...

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

- List of all members, including inherited members

## Properties

- cached : bool
- hue : real
- lightness : real
- saturation : real
- source : variant

## Detailed Description

HueSaturation is similar to the Colorize effect, but the hue and saturation property values are handled differently. The HueSaturation effect always shifts the hue, saturation, and lightness from the original, instead of setting them.

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
          }

          HueSaturation {
              anchors.fill: bug
              source: bug
              hue: -0.3
              saturation: 0.5
              lightness: -0.1
          }
      }

## 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`.

hue : real

This property defines the hue value which is added to the source hue value.

The value ranges from -1.0 (decrease) to 1.0 (increase). By default, the property is set to `0.0` (no change).

Output examples with different hue values |  |
--- | --- | ---
hue: -0.3 | hue: 0.0 | hue: 0.3
saturation: 0 | saturation: 0 | saturation: 0
lightness: 0 | lightness: 0 | lightness: 0

lightness : real

This property defines the lightness value which is added to the source saturation value.

The value ranges from -1.0 (decrease) to 1.0 (increase). By default, the property is set to `0.0` (no change).

Output examples with different lightness values |  |
--- | --- | ---
lightness: -0.5 | lightness: 0.0 | lightness: 0.5
hue: 0 | hue: 0 | hue: 0
saturation: 0 | saturation: 0 | saturation: 0

saturation : real

This property defines the saturation value value which is added to the source saturation value.

The value ranges from -1.0 (decrease) to 1.0 (increase). By default, the property is set to `0.0` (no change).

Output examples with different saturation values |  |
--- | --- | ---
saturation: -0.8 | saturation: 0.0 | saturation: 1.0
hue: 0 | hue: 0 | hue: 0
lightness: 0 | lightness: 0 | lightness: 0

source : variant

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

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