[英]How do I fade the edges of an image in Java? (example given)
我目前處於一個項目的中間,在該項目中,必須按下JButton來對灰度,藍色濾鏡,紅色濾鏡,綠色濾鏡進行着色,並淡化貓的圖片邊緣。 對圖片進行灰度和彩色過濾很容易,但是我似乎無法弄清楚如何將圖像的邊緣淡化為黑色。
我的意思是,我有這張需要更換的貓的照片:
我需要將其更改為類似以下內容:
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class GUIKittenPicJC {
public static class KittenChanger extends JPanel {
BufferedImage img = null;
File Kitten = null;
ImageIcon imagetransformed = null;
JButton grayscale = new JButton("Grayscale Image");
JButton rgbB = new JButton("Blue filter this image");
JButton rgbR = new JButton("Red filter this image");
JButton rgbG = new JButton("Green filter this image");
JButton fader = new JButton("Fade this image");
{
try
{
Kitten = new File("C:\\Users\\Jarrod\\Desktop\\Lab 3\\Lab 3\\kitten.bmp");
img = ImageIO.read(Kitten);
}
catch(IOException e)
{
System.out.println(e);
}
ImageIcon image = new ImageIcon(img);
JLabel imageLabel = new JLabel(image);
add(imageLabel);
grayscale.addActionListener(e->{
imagetransformed = new ImageIcon(Grayscale(img));
imageLabel.setIcon(imagetransformed);
imgReset();
});
rgbB.addActionListener(e->{
imagetransformed = new ImageIcon(Bluify(img));
imageLabel.setIcon(imagetransformed);
imgReset();
});
rgbG.addActionListener(e->{
imagetransformed = new ImageIcon(Greenify(img));
imageLabel.setIcon(imagetransformed);
imgReset();
});
rgbR.addActionListener(e->{
imagetransformed = new ImageIcon(Redify(img));
imageLabel.setIcon(imagetransformed);
imgReset();
});
add(grayscale);
add(rgbB);
add(rgbG);
add(rgbR);
}
private void imgReset() {
try {
img = ImageIO.read(Kitten);
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
public static void main(String[] args)
{
createGUI();
}
private static void createGUI() {
JFrame frame = new JFrame("Kitten Changer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
KittenChanger newContentPane = new KittenChanger();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.setSize(400, 500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
//Grayscale and rgb filter methods follow, not important to question
}
我將如何為這種過濾器創建一種方法,並將其像其他方法一樣正確地應用於按鈕?
您將必須分別編輯每個像素。 此解決方案的主要思想是,您擁有圖像的中心,並且每個像素隨到中心的距離而變化。
更簡單地說,距離中心較遠的像素將變暗。
這是您的代碼如下所示:
BufferedImage cat; //assuming it is assigned
for(int i = 0; i < cat.getWidth(); i++) { // i is the x coord
for(int j = 0; j < cat.getHeight(); j++) { // j is the y coord
int color = cat.getRGB(i, j);
int r = (color >> 16) & 0xff; //extract red value
int g = (color >> 8) & 0xff;
int b = color & 0xff;
double scale = 0.75; /**** Change this to change the resulting effect ****/
//pixel's distance from center
double dist = Math.sqrt( Math.pow(i - cat.getWidth()/2, 2) + Math.pow(j - cat.getHeight()/2, 2) );
r = (int) Math.max(0, r - dist*scale); //r - dist*scale makes px darker
g = (int) Math.max(0, g - dist*scale); //Math.max makes sure r is always >= 0
b = (int) Math.max(0, b - dist*scale);
int newRGB = (r << 16) + (g << 8) + b; //convert r,g,b to single int
cat.setRGB(i, j, newRGB); //finally, update rgb value
}
}
請記住,您始終可以通過更改上面代碼中的scale
變量來更改效果。
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