JavaFX | ColorAdjust Class

ColorAdjust class is a part of JavaFX. ColorAdjust class allows per-pixel adjustments of hue, saturation, brightness, and contrast. ColorAdjust class inherits Effect class.

Constructors of the class:

1. ColorAdjust(): Creates a new Object of ColorAdjust class
2. ColorAdjust(double hue, double saturation, double brightness, double contrast): Creates a new Object of ColorAdjust class with specified values of hue, satuartion, brightness and contrast.

Commonly Used Methods:

Below programs illustrate the use of ColorAdjust class:

1. Java Program to apply color Adjust effect to a image with specified hue, brightness, contrast and Saturation: In this program a FileInputStream is created and an image is taken as input from a file. Image named image is created using the input from file input stream. From the image a image view object is created and it is added to the VBox. The VBox is then added to the scene and the scene is added to the stage. A ColorAdjust effect is created and the values for hue, saturation, contrast and brightness are set using function setHue(), setBrightness(), setSaturation(), setContrast() and the effect is set to the image view using setEffect() function.
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   // Java Program to apply color Adjust effect // to a image with specified hue, brightness,  // contrast and Saturation import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.Stage; import javafx.scene.image.*; import javafx.scene.effect.*; import java.io.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Group;    public class ColorAdjust_1 extends Application {        // launch the application     public void start(Stage stage) throws Exception     {            // set title for the stage         stage.setTitle("ColorAdjust example");            // create a input stream         FileInputStream input = new FileInputStream("f:\\gfg.png");            // create a image         Image image = new Image(input);            // create a image View         ImageView imageview = new ImageView(image);            // create a ColorAdjust effect         ColorAdjust color_adjust = new ColorAdjust();            // set hue, saturation, brightness, and contrast         color_adjust.setHue(0.4);         color_adjust.setBrightness(0.6);         color_adjust.setContrast(0.8);         color_adjust.setSaturation(0.1);            // set effect         imageview.setEffect(color_adjust);            // create a VBox         VBox vbox = new VBox(imageview);            // create a scene         Scene scene = new Scene(vbox, 200, 200);            // set the scene         stage.setScene(scene);            stage.show();     }        // Main Method     public static void main(String args[])     {            // launch the application         launch(args);     } }

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2. Java Program to apply color Adjust effect to an image with hue, brightness, contrast, and Saturation is taken as input from the user(using text fields): In this program a FileInputStream is created and an image is taken as input from a file. Image named image is created using the input from the file input stream. From the image, an image view object is created and it is added to the VBox. The VBox is then added to the scene and the scene is added to the stage. A ColorAdjust effect is created and the values for hue, saturation, contrast and brightness are set using function setHue(), setBrightness(), setSaturation(), setContrast() and the effect is set to the image view using setEffect() function. We will create four text fields(hue, saturation, contrast, and brightness) and a Button button. The user will give the necessary values of hue, saturation, contrast, and brightness and the values will be applied to the image when the button is pressed. An EventHandler is created to handle the button events.
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   // Java Program to apply color Adjust effect // to a image with hue, brightness, contrast // and Saturation taken as input from from user import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.Stage; import javafx.scene.image.*; import javafx.scene.effect.*; import java.io.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Group;    public class ColorAdjust_2 extends Application {    // launch the application public void start(Stage stage) throws Exception {        // set title for the stage     stage.setTitle("ColorAdjust example");        // textfields     TextField hue, saturation, brightness, contrast;        // create the textFields     hue = new TextField("Hue");     saturation = new TextField("Saturation");     brightness = new TextField("Brightness");     contrast = new TextField("Contrast");        // create a input stream     FileInputStream input = new FileInputStream("f:\\gfg.png");        // create a image     Image image = new Image(input);        // create a image View     ImageView imageview = new ImageView(image);        // create a ColorAdjust effect     ColorAdjust color_adjust = new ColorAdjust();        // create a button     Button button = new Button("apply");        // action event     EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {         public void handle(ActionEvent e)         {             // set the hue, brightness, contrast and saturation             color_adjust.setHue(Double.parseDouble(hue.getText()));                            color_adjust.setBrightness(Double.parseDouble(                                      brightness.getText()));                                                     color_adjust.setContrast(Double.parseDouble(                                     contrast.getText()));                                                    color_adjust.setSaturation(Double.parseDouble(                                      saturation.getText()));         }     };        // set on action of button     button.setOnAction(event);        // set effect     imageview.setEffect(color_adjust);        // create a VBox     VBox vbox = new VBox(imageview, hue, saturation,                      brightness, contrast, button);        // create a scene     Scene scene = new Scene(vbox, 200, 400);        // set the scene     stage.setScene(scene);        stage.show(); }    // Main Method public static void main(String args[]) {        // launch the application     launch(args); } }

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Note: The above programs might not run in an online IDE. Please use an offline compiler.

Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/effect/ColorAdjust.html

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andrew1234

Third year Department of Information Technology Jadavpur University