package com.stefan.test;
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.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
/**
* 将白底图片转换成透明底图片
* @author klaus
* @version 1.0.0
*
*/
public class Alpha {
public static void main(String[] args) {
String fileUrl = "C:/Users/passw/Desktop/time.jpg";
System.out.println(transferAlpha2File(fileUrl,fileUrl));
}
/**
* @param imgSrc 原图片地址
* @param imgTarget 新图片地址
* @return 转换结果ture or false
*/
public static boolean transferAlpha2File(String imgSrc, String imgTarget) {
File file = new File(imgSrc);
InputStream is = null;
boolean result = false;
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());
result = ImageIO.write(bufferedImage, "png", new File(imgTarget));// 直接输出文件
// result = ImageIO.write(bufferedImage, "jpg", new File(imgTarget));// 直接输出文件
} catch (Exception e) {
e.printStackTrace();
result = false;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
return result;
}
public static byte[] transferAlpha2Byte(String imgSrc) {
ByteArrayOutputStream byteArrayOutputStream = null;
File file = new File(imgSrc);
InputStream is = null;
byte[] result = null;
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());
byteArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "png", byteArrayOutputStream);// 转换成byte数组
result = byteArrayOutputStream.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
if (byteArrayOutputStream != null) {
try {
byteArrayOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
return result;
}
}