最近在做一个需求是从数据库里面取出图片,但是图片都有一个白色的背景,于是项目组希望可以将图片的白色的背景去掉

如图所示:

java如何对图片去除图片的白色的背景_java

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java如何对图片去除图片的白色的背景_image_02

当然在这个上面是看不出来的,其实第一张图片是有一个白色的背景的,但是第二张图片没有,相信你理解我说的,那么这个代码我应该如何实现:

package com.wdg.util;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

public class ImageUtil {
public static void main(String[] args) {
transferAlpha();
}

public static byte[] transferAlpha() {

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
File file = new File("D:\\08\\11.png");
InputStream is;
try {
is = new FileInputStream(file);
// 如果是MultipartFile类型,那么自身也有转换成流的方法:is = file.getInputStream();
BufferedImage bi = ImageIO.read(is);
Image image = (Image) bi;
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);

int R = (rgb & 0xff0000) >> 16;
int G = (rgb & 0xff00) >> 8;
int B = (rgb & 0xff);
if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
}

bufferedImage.setRGB(j2, j1, rgb);

}
}

g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
ImageIO.write(bufferedImage, "png", new File("D:\\08\\12.png"));// 直接输出文件
} catch (Exception e) {
e.printStackTrace();
} finally {

}
return byteArrayOutputStream.toByteArray();
}
}

代码是对图片进行操作,复制过去就可以直接实现你的功能了

希望对你有所帮助