【Java】图像透明渐变融合

    //获取旗帜
        File flag_file=new File("五星红旗.jpg");
        BufferedImage flag_image=ImageIO.read(flag_file);

        //获取头像
        File head_file=new File("1.jpg");
        BufferedImage head_image=ImageIO.read(head_file);

        //求旗帜和头像最小长宽
        int w1=flag_image.getWidth();
        int h1=flag_image.getHeight();
        int w2=head_image.getWidth();
        int h2=head_image.getHeight();
        int w=w1>16;     //R
                rgbs[1]=(rgb&0xff00)>>8;        //G
                rgbs[2]=rgb&0xff;               //B
                int alpha=(int)(255*(1-((float)i/(float)w)));   //透明度
                Color c=new Color(rgbs[0],rgbs[1],rgbs[2],alpha);
                g.setColor(c);
                g.drawLine(i,j,i,j);
            }
        }

        //输出图像
        OutputStream out=new FileOutputStream(new_file);
        ImageIO.write(new_image, "jpg", out);

输入：五星红旗.jpg，1.jpg

输出：out.jpg