JAva画像の背景が透明
1932 ワード
package com.picture;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.regex.Pattern;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
public class Picture {
public static void convert(String path) {
// TODO Auto-generated constructor stub
try {
BufferedImage image = ImageIO.read(new File(path));
ImageIcon imageIcon = new ImageIcon(image);
BufferedImage bufferedImage = new BufferedImage(
imageIcon.getIconWidth(), imageIcon.getIconHeight(),
BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
g2D.drawImage(imageIcon.getImage(), 0, 0,
imageIcon.getImageObserver());
int alpha = 0;
for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage
.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage
.getWidth(); j2++) {
int rgb = bufferedImage.getRGB(j2, j1);
if (colorInRange(rgb))
alpha = 0;
else
alpha = 255;
rgb = (alpha << 24) | (rgb & 0x00ffffff);
bufferedImage.setRGB(j2, j1, rgb);
}
}
g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
// PNG
String outFile = path.substring(0, path.lastIndexOf("."));
ImageIO.write(bufferedImage, "png", new File(outFile + ".png"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static int color_range = 210;
public static boolean colorInRange(int color) {
int red = (color & 0xff0000) >> 16;
int green = (color & 0x00ff00) >> 8;
int blue = (color & 0x0000ff);
if (red >= color_range && green >= color_range && blue >= color_range)
return true;
return false;
}
}