java 图片处理

时间 2019-11-06

标签 java 图片处理栏目 Java 繁體版

原文原文链接

1.读取图片spa

File f = new File(“c:\images\myimage.gif”);server

BufferedImage bi = ImageIO.read(f);图片

2.写图片ci

BufferedImage im = new BufferedImage(0, 0, BufferedImage. TYPE_INT_RGB);get

ImageIO. write(im, "png" , new File( "d://img.png"));it

3.图片的信息table

BufferedImage bufferedImage = ImageIO.read(new File("d:/zxing.png"));gc

bufferedImage.getWidth(); //宽度im

bufferedImage.getHeight(); //高度img

bufferedImage.getRGB(23,56); //某个位置

4.图片合并

BufferedImage nestImage = ImageIO.read(new File("d:/zxing.png"));
BufferedImage newImage = new BufferedImage(200, 200, BufferedImage.TYPE_INT_ARGB);

Graphics2D graphics = newImage.createGraphics();
// (a-b)/2 center
graphics.drawImage(nestImage, 100, 100, null);
nestImage.flush();
graphics.dispose();

Graphics2D.drawImage(img, x, y, width, height, observer)
Graphics2D.drawImage(img, x, y, width, height, bgcolor, observer)

5.改变图片大小 BufferedImage.getScaledInstance(200, 200, Image.SCALE_SMOOTH) 得到比例大小的图片

//缩小后的大小为200X200
BufferedImage nestImage = ImageIO.read(new File("d:/zxing.png"));
BufferedImage newImage = new BufferedImage(200, 200, BufferedImage.TYPE_INT_ARGB);
newImage.getGraphics().drawImage(nestImage.getScaledInstance(200, 200, Image.SCALE_SMOOTH), 0, 0, null);

6.带水印以图片合并的方式来添加一个水印

BufferedImage image = ImageIO.read(new File("d:/zxing.png")); BufferedImage waterMark = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB); Graphics2D graphics2d = waterMark.createGraphics(); graphics2d.drawImage(image, 0, 0,400,400, null); graphics2d.setColor(Color.GRAY); graphics2d.setFont(new Font(Font.SERIF, Font.BOLD, 40)); graphics2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, .8f)); graphics2d.drawString("worterMarker", 100, 100); image.flush(); graphics2d.dispose();