Colorize QML Type | Qt Graphical Effects 5.15.18

- Qt 5.15
- Qt Graphical Effects
- QML Types
- Colorize QML Type
- Qt 5.15.18 Reference Documentation

# Colorize QML Type

Sets the color in the HSL color space. More...

Import Statement: | import QtGraphicalEffects 1.15
Since: | QtGraphicalEffects 1.0

- List of all members, including inherited members

## Properties

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

## Detailed Description

The effect is similar to what happens when a colorized glass is put on top of a grayscale image. Colorize uses the hue, saturation, and lightness (HSL) color space. You can specify a desired value for each property. You can shift all HSL values with the HueSaturation effect.

Alternatively, you can use the ColorOverlay effect to colorize the source item in the RGBA color space.

Source | Effect applied
--- | ---

Note: This effect is available when running with OpenGL.

## Example

The following example shows how to apply the effect.

     import QtQuick 2.12
     import QtGraphicalEffects 1.12

     Item {
         width: 300
         height: 300

         Image {
             id: bug
             source: "images/bug.jpg"
             sourceSize: Qt.size(parent.width, parent.height)
             smooth: true
             visible: false
         }

         Colorize {
             anchors.fill: bug
             source: bug
             hue: 0.0
             saturation: 0.5
             lightness: -0.2
         }
     }

## 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 used to colorize the source.

The value ranges from 0.0 to 1.0. By default, the property is set to `0.0`, which produces a slightly red color.

Allowed hue values

Output examples with different hue values |  |
--- | --- | ---
hue: 0.2 | hue: 0.5 | hue: 0.8
saturation: 1 | saturation: 1 | saturation: 1
lightness: 0 | lightness: 0 | lightness: 0

lightness : real

This property defines how much the source lightness value is increased or decreased.

Unlike hue and saturation properties, lightness does not set the used value, but it shifts the existing source pixel lightness value.

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

Output examples with different lightness values |  |
--- | --- | ---
lightness: -0.75 | lightness: 0 | lightness: 0.75
hue: 0 | hue: 0 | hue: 0
saturation: 1 | saturation: 1 | saturation: 1

saturation : real

This property defines the saturation value which is used to colorize the source.

The value ranges from 0.0 (desaturated) to 1.0 (saturated). By default, the property is set to `1.0` (saturated).

Output examples with different saturation values |  |
--- | --- | ---
saturation: 0 | saturation: 0.5 | saturation: 1
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.