本文介绍了减少颜色数量并获得单个像素的颜色的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
使用JavaFX 2.2我需要执行以下操作：
Using JavaFX 2.2 I need to do the following:
- 减少给定图像的颜色（例如使用JavaFX <$
- 访问图像对象中单个像素的颜色 - 确定，似乎
Image.getPixelReader（）应该执行此作业，因此只有第一个问题应该保留
- Reduce the color of a given image (e.g. loaded using the JavaFX
imageclass) to lets say 8 or 16 colors, or maybe 256 colors - Access the color of single pixels in the image object - OK, seems like
Image.getPixelReader()should do the job, so only the first question should remain
任何人都可以给我一些提示或代码示例吗？感谢： - ）
Can anyone give me some hints or code examples on this? Thanks :-)
推荐答案
- 使用
image.getPixelReader（） code>获取访问图片中的各个像素。 - 创建。
- 取得。
- 迭代从像素读取器读取的像素，通过缩小算法为每个像素调色，并将缩小的像素写入像素写入器。
Useimage.getPixelReader()to get a hold of the PixelReader to access individual pixels in the image.Create a WritableImage.Get the PixelWriter of the WritableImage.Iterate through the pixels read from the pixel reader, run each pixel through a downscaling algorithm for it's color palette and write the downscaled pixel to the pixel writer.
import javafx.application.Application;
import javafx.event.*;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.image.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
// displays a button with a 64 color image palette and a full color palette when pressed.
public class ButtonShadeTest extends Application {
@Override public void start(final Stage stage) throws Exception {
final Label response = new Label("");
final Image originalImage = new Image("http://icons.iconarchive.com/icons/eponas-deeway/colobrush/128/heart-2-icon.png");
final Image resampledImage = resample(originalImage);
final ImageView imageView = new ImageView(resampledImage);
final Button button = new Button("I love you", imageView);
button.setStyle("-fx-base: coral;");
button.setContentDisplay(ContentDisplay.TOP);
button.setOnAction(new EventHandler<ActionEvent>() {
@Override public void handle(ActionEvent event) {
if ("".equals(response.getText())) {
response.setText("I love you too!");
imageView.setImage(originalImage);
} else {
response.setText("");
imageView.setImage(resampledImage);
}
}
});
final VBox layout = new VBox(10);
layout.setAlignment(Pos.CENTER);
layout.getChildren().addAll(button, response);
layout.setStyle("-fx-background-color: cornsilk; -fx-padding: 10; -fx-font-size: 20;");
stage.setTitle("Heart");
stage.getIcons().add(originalImage);
stage.setScene(new Scene(layout));
stage.show();
}
public static void main(String[] args) { launch(args); }
// downsamples an image to a 64 color palette by only
// using the 2 most significant bits of color to represent
// each of the image's pixels.
private Image resample(Image inputImage) {
int W = (int) inputImage.getWidth();
int H = (int) inputImage.getHeight();
WritableImage outputImage = new WritableImage(W, H);
PixelReader reader = inputImage.getPixelReader();
PixelWriter writer = outputImage.getPixelWriter();
for (int y = 0; y < H; y++) {
for (int x = 0; x < W; x++) {
int argb = reader.getArgb(x, y);
int a = (argb >> 24) & 0xFF;
int r = (argb >> 16) & 0xFF;
int g = (argb >> 8) & 0xFF;
int b = argb & 0xFF;
r = r & 0xC0;
g = g & 0xC0;
b = b & 0xC0;
argb = (a << 24) | (r << 16) | (g << 8) | b;
writer.setArgb(x, y, argb);
}
}
return outputImage;
}
}
// icon license: (creative commons with attribution) http://creativecommons.org/licenses/by-nc-nd/3.0/
// icon artist attribution page: (eponas-deeway) http://eponas-deeway.deviantart.com/gallery/#/d1s7uih
当心脏碎裂时，它会显示一个减少的调色板，当心脏是整体时，它会显示一个完整的调色板。
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