BrightnessContrast QML Type

The following example shows how to apply the effect.

import QtQuick
import Qt5Compat.GraphicalEffects

Item {
    width: 300
    height: 300

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

    BrightnessContrast {
        anchors.fill: bug
        source: bug
        brightness: 0.5
        contrast: 0.5
    }
}

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

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

Output examples with different brightness values
brightness: -0.25	brightness: 0	brightness: 0.5
contrast: 0	contrast: 0	contrast: 0

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.

This property defines how much the source contrast is increased or decreased. The decrease of the contrast is linear, but the increase is applied with a non-linear curve to allow very high contrast adjustment at the high end of the value range.

Contrast adjustment curve

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

Output examples with different contrast values
contrast: -0.5	contrast: 0	contrast: 0.5
brightness: 0	brightness: 0	brightness: 0

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