package cc.mrbird.febs.mall.test;
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import com.sun.image.codec.jpeg.JPEGCodec;
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import com.sun.image.codec.jpeg.JPEGEncodeParam;
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import com.sun.image.codec.jpeg.JPEGImageEncoder;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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public class PixelateImage {
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public static void main(String[] args) {
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handleDpi(new File("D:\\image\\inputDpi.png"),50,50);
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getPixel("D:\\image\\input.png");
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try {
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resizeImage("D:\\image\\input.png","D:\\image\\output.png",360);//将图片压缩至100宽
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* 功能：获取图片像素
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* * @param filePath 图片路径
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*/
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public static void getPixel(String filePath){
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File file = new File(filePath);
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BufferedImage bi = null;
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try {
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bi = ImageIO.read(file);
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} catch (Exception e) {
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e.printStackTrace();
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}
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int width = bi.getWidth(); // 像素
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int height = bi.getHeight(); // 像素
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System.out.println("width=" + width + ",height=" + height + ".");
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}
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/**
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* @param inputPath 源图片路径
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* @param outputPath 修改大小后图片路径
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* @param scaleSize 图片的修改比例，目标宽度
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*/
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public static void resizeImage(String inputPath, String outputPath,int scaleSize) throws IOException {
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File srcFile = new File(inputPath);
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Image srcImg = ImageIO.read(srcFile);
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BufferedImage bi = null;
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try {
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bi = ImageIO.read(srcFile);
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} catch (Exception e) {
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e.printStackTrace();
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}
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float width = bi.getWidth(); // 像素
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float height = bi.getHeight(); // 像素
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float scale = width/scaleSize;
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BufferedImage buffImg = null;
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buffImg = new BufferedImage(scaleSize, (int)(height/scale), BufferedImage.TYPE_INT_RGB);
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//使用TYPE_INT_RGB修改的图片会变色
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buffImg.getGraphics().drawImage(
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srcImg.getScaledInstance(scaleSize, (int)(height/scale), Image.SCALE_SMOOTH), 0,
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0, null);
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ImageIO.write(buffImg, "JPEG", new File(outputPath));
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}
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/**
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* 改变图片DPI
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*
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* @param file
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* @param xDensity
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* @param yDensity
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*/
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public static void handleDpi(File file, int xDensity, int yDensity) {
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try {
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BufferedImage image = ImageIO.read(file);
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JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(new FileOutputStream(file));
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JPEGEncodeParam jpegEncodeParam = jpegEncoder.getDefaultJPEGEncodeParam(image);
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jpegEncodeParam.setDensityUnit(JPEGEncodeParam.DENSITY_UNIT_DOTS_INCH);
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jpegEncoder.setJPEGEncodeParam(jpegEncodeParam);
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jpegEncodeParam.setQuality(0.1f, false);
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jpegEncodeParam.setXDensity(xDensity);
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jpegEncodeParam.setYDensity(yDensity);
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jpegEncoder.encode(image, jpegEncodeParam);
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image.flush();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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