public void replaceImageColor(String file, Color srcColor, Color targetColor) throws IOException{        URL http;        if(file.trim().startsWith("https")){            http = new URL(file);            HttpsURLConnection conn = (HttpsURLConnection) http.openConnection();            conn.setRequestMethod("GET");         }else if(file.trim().startsWith("http")){            http = new URL(file);            HttpURLConnection conn = (HttpURLConnection) http.openConnection();            conn.setRequestMethod("GET");         }else{            http = new File(file).toURI().toURL();        }        BufferedImage bi = ImageIO.read(http.openStream());                for (int i = 0; i < bi.getWidth(); i++) {            for (int j = 0; j < bi.getHeight(); j++) {                  System.out.println(bi.getRGB(i, j));                  if(srcColor.getRGB()==bi.getRGB(i, j)){                      System.out.println(i+","+j+"  from:"+srcColor.getRGB()+"to"+targetColor.getRGB());                      bi.setRGB(i, j, targetColor.getRGB());                  }            }        }        Iterator<ImageWriter> it = ImageIO.getImageWritersByFormatName("png");        ImageWriter writer = it.next();        File f = new File("c://test02.png");        ImageOutputStream ios = ImageIO.createImageOutputStream(f);        writer.setOutput(ios);        writer.write(bi);        bi.flush();        ios.flush();        ios.close();    }        public void createImage(int width, int height) throws IOException{        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);        Graphics2D graphic = bi.createGraphics();        graphic.setColor(new Color(0.2f,0.3f,0.4f,0.4f));        graphic.fillRect(0, 0, width, height);                for (int i = 0; i < width; i++) {            for (int j = 0; j < height; j++) {                  //result[i][j] = bi.getRGB(i, j) & 0xFFFFFF;                  System.out.println(bi.getRGB(i, j));                 // bi.setRGB(i, j, 0xFFFFFF);            }       }                Iterator<ImageWriter> it = ImageIO.getImageWritersByFormatName("png");        ImageWriter writer = it.next();        File f = new File("c://test02.png");        ImageOutputStream ios = ImageIO.createImageOutputStream(f);        writer.setOutput(ios);                writer.write(bi);    }