zoukankan      html  css  js  c++  java
  • java将白色背景图片转换成无色

    package com.cxf.dao;
    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 Alpha {
        public static void main(String[] args) {
            transferAlpha();
        }
    
    public static byte[] transferAlpha() {
    
       ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
       File file = new File("E:/07.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("e:/67.png"));//直接输出文件 // ImageIO.write(bufferedImage, "png", byteArrayOutputStream);//转换成byte数组 } catch (Exception e) { e.printStackTrace(); }finally{ } return byteArrayOutputStream.toByteArray(); } }
  • 相关阅读:
    [转]java.lang.OutOfMemoryError: Java heap space内存不足问题
    xx
    HTTP协议详解--(转)
    树的子结构
    合并两个排序的链表
    链表反转
    环的入口节点
    链表中倒数第k个节点 (相关的 单链表的中间节点!)
    正则表达式
    表示数值的字符串
  • 原文地址:https://www.cnblogs.com/zrui-xyu/p/4995508.html
Copyright © 2011-2022 走看看