blend – Adding lighting effect to clipped image in Javafx

blend – Adding lighting effect to clipped image in Javafx

Solution

Apply a ColorAdjust effect to the Lighting effect in an effect chain.

The lighting effect is going to change the appearance and color of the image to some extent no matter what you do (because that is what lighting does), but by applying the additional color adjustment, you can get an image which is recognizably pretty close to the original coloring.

If you need to adjust the shape of the image, snapshot the clipped image and apply the effect to the snapshot if that is what you want, as explained in the answer to: Border-Radius and Shadow on ImageView.

Example

// increase brightness and contrast.
ColorAdjust brightLight = new ColorAdjust(0, 0, .25, 0.25); 

// chain in your lighting effect.
brightLight.setInput(lighting);

// apply the chained effect to your image.
ImageView litAdjusted = new ImageView(image);
litAdjusted.setEffect(brightLight);

Executable sample

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.effect.*;
import javafx.scene.image.*;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.text.TextAlignment;
import javafx.stage.Stage;

// Java 8 code
public class HereBeDragons extends Application {

    @Override public void start(final Stage stage) {
        Image image     = new Image(imageLoc);
        Image clipImage = new Image(CLIP_IMAGE_LOC);

        ImageView plain = new ImageView(image);

        ImageView lit = new ImageView(image);
        Lighting lighting = createLighting();
        lit.setEffect(lighting);

        ImageView litAdjusted = new ImageView(image);
        ColorAdjust brightLight = new ColorAdjust(0, 0, .25, 0.25);
        brightLight.setInput(lighting);
        litAdjusted.setEffect(brightLight);

        plain.setClip(new ImageView(clipImage));
        SnapshotParameters params = new SnapshotParameters();
        params.setFill(Color.TRANSPARENT);
        WritableImage clippedImage = plain.snapshot(params, null);
        ImageView litAdjustedClip = new ImageView(clippedImage);
        litAdjustedClip.setEffect(brightLight);
        plain.setClip(null);

        HBox layout = new HBox(
                10,
                new CaptionedImage(plain,       Plain),
                new CaptionedImage(lit,         Lit),
                new CaptionedImage(litAdjusted, Lit and Adjusted),
                new CaptionedImage(litAdjustedClip, Clipped,nLit and Adjusted)
        );
        layout.setPadding(new Insets(20));
        layout.setStyle(-fx-background-color: lightblue;);

        stage.setTitle(Here be Dragons);
        stage.setScene(new Scene(layout, Color.LIGHTBLUE));
        stage.setResizable(false);
        stage.show();
    }

    private Lighting createLighting() {
        // Create ambient light
        Light.Distant light = new Light.Distant();
        light.setAzimuth(-135.0);

        // Create lighting effect
        Lighting lighting = new Lighting();
        lighting.setLight(light);
        lighting.setSurfaceScale(4.0);

        return lighting;
    }

    private class CaptionedImage extends Label {
        public CaptionedImage(ImageView imageView, String caption) {
            setText(caption);
            setGraphic(imageView);
            setContentDisplay(ContentDisplay.TOP);
            setTextAlignment(TextAlignment.CENTER);

            setStyle(
                    -fx-text-fill: midnightblue;  +
                    -fx-font-size: 16px;  +
                    -fx-font-family: palatino;  +
                    -fx-font-style: italic;
            );
        }
    }

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

    private static final String imageLoc =
        http://icons.iconarchive.com/icons/custom-icon-design/round-world-flags/128/Wales-icon.png;    
    // icon license: Free for non-commercial use. 
    // Buy commercial license here: 
    // http://www.customicondesign.com/free-icons/flag-icon-set/flat-round-world-flag-icon-set

    private static final String CLIP_IMAGE_LOC =
            http://icons.iconarchive.com/icons/gpritiranjan/simple-christmas/128/star-icon.png;
    // star icon license: freeware, commercial usage allowed.
}

blend – Adding lighting effect to clipped image in Javafx