Friday, December 21, 2012

Retrieve color components from image

Retrieve color components from image
Retrieve color components from image


To retrieve various components from a Color object, call it's methods getRed(), getGreen(), getBlue(), getBrightness(), getHue(), getSaturation() and getOpacity()...

package testjavafx;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelReader;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class TestJavaFX extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        
        Image image = new Image("http://goo.gl/kYEQl");
        ImageView imageView = new ImageView();
        imageView.setImage(image);
        
        PixelReader pixelReader = image.getPixelReader();
        
        int width = (int)image.getWidth();
        int height = (int)image.getHeight();
        
        //Copy from source to destination pixel by pixel
        WritableImage writableImage 
                = new WritableImage(width, height);
        PixelWriter pixelWriter = writableImage.getPixelWriter();
        
        WritableImage writableImageRed 
                = new WritableImage(width, height);
        PixelWriter pixelWriterRed = writableImageRed.getPixelWriter();
        
        WritableImage writableImageGreen 
                = new WritableImage(width, height);
        PixelWriter pixelWriterGreen = writableImageGreen.getPixelWriter();
        
        WritableImage writableImageBlue 
                = new WritableImage(width, height);
        PixelWriter pixelWriterBlue = writableImageBlue.getPixelWriter();
        
        WritableImage writableImageBrightness 
                = new WritableImage(width, height);
        PixelWriter pixelWriterBrightness = writableImageBrightness.getPixelWriter();
        
        WritableImage writableImageHue 
                = new WritableImage(width, height);
        PixelWriter pixelWriterHue = writableImageHue.getPixelWriter();
        
        WritableImage writableImageSaturation 
                = new WritableImage(width, height);
        PixelWriter pixelWriterSaturation = writableImageSaturation.getPixelWriter();
        
        WritableImage writableImageOpacity 
                = new WritableImage(width, height);
        PixelWriter pixelWriterOpacity = writableImageOpacity.getPixelWriter();
        
        for (int y = 0; y < height; y++){
            for (int x = 0; x < width; x++){
                Color color = pixelReader.getColor(x, y);
                pixelWriter.setColor(x, y, color);
                
                double red = color.getRed();
                double green = color.getGreen();
                double blue = color.getBlue();
                double brightness = color.getBrightness();
                double hue = color.getHue()/360.0;  //getHue() return 0.0-360.0
                double saturation = color.getSaturation();
                double opacity = color.getOpacity();
                
                pixelWriterRed.setColor(x, y, new Color(red, 0.0, 0.0, 1.0));
                pixelWriterGreen.setColor(x, y, new Color(0.0, green, 0.0, 1.0));
                pixelWriterBlue.setColor(x, y, new Color(0.0, 0.0, blue, 1.0));
                
                pixelWriterBrightness.setColor(x, y, new Color(brightness, brightness, brightness, 1.0));
                pixelWriterHue.setColor(x, y, new Color(hue, hue, hue, 1.0));
                pixelWriterSaturation.setColor(x, y, new Color(saturation, saturation, saturation, 1.0));
                pixelWriterOpacity.setColor(x, y, new Color(opacity, opacity, opacity, 1.0));
            }
        }
        
        ImageView destImageView = new ImageView();
        destImageView.setImage(writableImage);
        ImageView imageViewRed = new ImageView();
        imageViewRed.setImage(writableImageRed);
        ImageView imageViewGreen = new ImageView();
        imageViewGreen.setImage(writableImageGreen);
        ImageView imageViewBlue = new ImageView();
        imageViewBlue.setImage(writableImageBlue);
        
        ImageView imageViewBrightness = new ImageView();
        imageViewBrightness.setImage(writableImageBrightness);
        ImageView imageViewHue = new ImageView();
        imageViewHue.setImage(writableImageHue);
        ImageView imageViewSaturation = new ImageView();
        imageViewSaturation.setImage(writableImageSaturation);
        ImageView imageViewOpacity = new ImageView();
        imageViewOpacity.setImage(writableImageOpacity);
        
        HBox hBox = new HBox();
        hBox.getChildren().addAll(imageView, destImageView, 
                imageViewRed, imageViewGreen, imageViewBlue,
                imageViewBrightness, imageViewHue, imageViewSaturation, imageViewOpacity);

        StackPane root = new StackPane();
        root.getChildren().add(hBox);
        Scene scene = new Scene(root, 400, 100);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}


Next:
- Adjust color components of red, green and blue of image

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