colorFilter not working[Unsolved], how use camera flash on android?[Solved]

[aqamorisny]

i try to add some Button to Qt 5.7 example, declarative-camera . . .
http://doc.qt.io/qt-5/qtmultimedia-multimedia-declarative-camera-example.html

CameraButton {
                text: "Negative"
                onClicked: captureControls.camera.imageProcessing.setColorFilter(CameraImageProcessing.ColorFilterNegative)
            }

            CameraButton {
                text: "Tungsten"
                onClicked: captureControls.camera.imageProcessing.setWhiteBalanceMode(CameraImageProcessing.WhiteBalanceTungsten)
            }
            CameraButton {
                text: "contrast"
                onClicked: captureControls.camera.imageProcessing.setContrast(1.0)
            }

• "Tungsten" Button work but "contrast" and "Negative" not working. how i can fix it?

• declarative camera example has flash image included below but this example not use camera flash, why?

multimedia/declarative-camera/images/

[galaxyHu]

@aqamorisny
not use camera flash? what is your meanings? Did you set the camera mode in your code. turn on flash should use "camera.flash.mode = Camera.FlashVideoLight"

[aqamorisny]

@galaxyHu

many thanks for your reply

turn on flash should use "camera.flash.mode = Camera.FlashVideoLight"

i test it , works! and now i can turn on and off flash.

not use camera flash? what is your meanings?

my mean: preview of the example has flash button But you can't find any line of code that included "flash" word in this example :
http://doc.qt.io/qt-5/qtmultimedia-multimedia-declarative-camera-example.html

when you run the example on android phone have flash you can't see flash button!

Did you set the camera mode in your code.

i run Qt Example and only edit this file, how to setup?
http://doc.qt.io/qt-5/qtmultimedia-multimedia-declarative-camera-photocapturecontrols-qml.html

[aqamorisny]

@galaxyHu

how i can set color filter, i want to use filters in my application:
https://github.com/aqamorisny/scanqt/

[galaxyHu]

@aqamorisny
this example did not use the flash.