我尝试将浮雕效果(也称为凹凸贴图)添加到复杂的剪裁图像中。 (即一 block 拼图。) 这可以通过每个像素的操作来完成,但它非常昂贵:裁剪的确切形式是运行时确定的,因此即使是凹凸贴图也必须在运行时生成。
JavaFX 的光照效果提供了类似的现成效果:
// Create clipping
pieceClip = createPiece(topEdge, leftEdge, bottomEdge, rightEdge);
pieceClip.setFill(Color.WHITE);
pieceClip.setStroke(null);
// Create clipped image view
imageView.setImage(image);
imageView.setClip(pieceClip);
// 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);
// Create shape to apply lighting on (the shape is the same as the clipping)
Shape pieceStroke1 = createPiece(topEdge, leftEdge, bottomEdge, rightEdge);
pieceStroke1.setFill(new Color(1, 1, 1, 0.4));
pieceStroke1.setStroke(null);
// Apply lighting
pieceStroke1.setEffect(lighting);
// Add clipped image and lighting overlay to the shape
getChildren().addAll(imageView, pieceStroke1);
这个效果差不多,灯光效果:
但是,它有一个副作用:由于叠加层是白色的并且只是半透明的,它会使图像变暗(使其有点模糊,不像以前那么生动)。
我尝试使用 Blend(COLOR_BURN、DARKEN 等)来恢复图像颜色,但由于对这些效果不太熟悉,所以我失败了。
如何保留我的图像色彩饱和度,但应用浮雕效果?
我有几个想法如何去做,但我不知道哪个可行:
- 直接对图像应用光照。 它失败了,因为光照应用于未剪切的图像。
- 通过在图像或光照叠加层上应用混合效果来纠正颜色饱和度降低 由于我对这些效果的无能,它失败了。
- 剪裁覆盖形状以仅覆盖受光照影响的区域 它需要对贝塞尔曲线进行偏移,这很难而且成本很高。
- 改变叠加层形状 alpha 以跟随光照效果强度。
任何想法将不胜感激。
最佳答案
解决方案
申请ColorAdjust对 Lighting 的影响效果链中的效果。
无论您做什么,照明效果都会在某种程度上改变图像的外观和颜色(因为照明就是这样做的),但是通过应用额外的颜色调整,您可以获得可识别的图像非常接近原始着色。
如果您需要调整图像的形状,请对剪裁的图像进行快照并将效果应用到快照(如果需要),如对以下内容的回答中所述:Border-Radius and Shadow on ImageView .
示例
// 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);
可执行样本
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.
}
关于javafx - 在 Javafx 中向剪切图像添加照明效果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24011175/