【阳哥专栏】Java图片缩放

本帖最后由就业指导－王震阳老师于 2014-9-20 18:45 编辑

用Java实现图片的缩放。

package com.test;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import javax.swing.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.Kernel;
import java.awt.image.ConvolveOp;
public class ImageUtil {
public static void resize(File originalFile, File resizedFile,
int newWidth, float quality) throws IOException {
if (quality > 1) {
throw new IllegalArgumentException(
"Quality has to be between 0 and 1");
}
ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
Image i = ii.getImage();
Image resizedImage = null;
int iWidth = i.getWidth(null);
int iHeight = i.getHeight(null);
if (iWidth > iHeight) {
resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
/ iWidth, Image.SCALE_SMOOTH);
} else {
resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
newWidth, Image.SCALE_SMOOTH);
}
// This code ensures that all the pixels in the image are loaded.
Image temp = new ImageIcon(resizedImage).getImage();
// Create the buffered image.
BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
// Copy image to buffered image.
Graphics g = bufferedImage.createGraphics();
// Clear background and paint the image.
g.setColor(Color.white);
g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
g.drawImage(temp, 0, 0, null);
g.dispose();
// Soften.
float softenFactor = 0.05f;
float[] softenArray = { 0, softenFactor, 0, softenFactor,
1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };
Kernel kernel = new Kernel(3, 3, softenArray);
ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
bufferedImage = cOp.filter(bufferedImage, null);
// Write the jpeg to a file.
FileOutputStream out = new FileOutputStream(resizedFile);
// Encodes image as a JPEG data stream
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder
.getDefaultJPEGEncodeParam(bufferedImage);
param.setQuality(quality, true);
encoder.setJPEGEncodeParam(param);
encoder.encode(bufferedImage);
} // Example usage
public static void main(String[] args) throws IOException {
// File originalImage = new File("C:\\11.jpg");
// resize(originalImage, new File("c:\\11-0.jpg"),150, 0.7f);
// resize(originalImage, new File("c:\\11-1.jpg"),150, 1f);
File originalImage = new File("C:\\1207.gif");
resize(originalImage, new File("c:\\1207-0.jpg"),150, 0.7f);
resize(originalImage, new File("c:\\1207-1.jpg"),150, 1f);
}
}

复制代码

lishuliang28 · lishuliang28

基本上可以看懂但是自己不能弄个写处理啊

lanzy1989 · lanzy1989

原理有没有解释一下的？

泡沫__opt · 泡沫__opt

学习额……

@for · @for

。。。。。。。。。有点难啊，

yuZhe_toString · yuZhe_toString

。。。。为什么没注释？

alpha.huai · alpha.huai

我找找原来做数学建模，有做图像相似拼接的代码。给个很多碎纸片图片，拼接。

剛☆_☆ · 剛☆_☆

怎么没注释？？？？

梦开始的地方 · 梦开始的地方

貌似很实用，感谢分享

邓士林 · 邓士林

老师，com.sun.image.codec.jpeg.JPEGImageEncoder;这个包是不是要单独下载导入进去啊！java自带的没有呢

邓士林 · 邓士林

FileOutputStream out = new FileOutputStream(resizedFile);
这句为什么在Eclipse里面报错啊！java.io.FileNotFoundException

亚特兰蒂斯 · 亚特兰蒂斯

:lol:lol:lol:lol:lol:lol:lol:lol

shaoshuai · shaoshuai

很不错，学习了

yzmaodeng · yzmaodeng

有用收走。。。。。哈哈

as604049322 · as604049322

邓士林发表于 2015-3-1 11:53
老师，com.sun.image.codec.jpeg.JPEGImageEncoder;这个包是不是要单独下载导入进去啊！java自带的没有呢 ...

import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
要怎么玩啊？？？

as604049322 · as604049322

运行成功了，压缩效果挺不错

package teacher.wangzengyang;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import javax.swing.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.Kernel;
import java.awt.image.ConvolveOp;
public class ImageUtil {
public static void resize(File originalFile,
int newWidth, float quality) throws IOException {
if (quality > 1) {
throw new IllegalArgumentException(
"Quality has to be between 0 and 1");
}
String[] name=originalFile.getName().split("\\.");
File resizedFile=new File(originalFile.getParentFile(),name[0]+"_new."+name[1]);
ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
Image i = ii.getImage();
Image resizedImage = null;
int iWidth = i.getWidth(null);
int iHeight = i.getHeight(null);
if (iWidth > iHeight) {
resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
/ iWidth, Image.SCALE_SMOOTH);
} else {
resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
newWidth, Image.SCALE_SMOOTH);
}
// This code ensures that all the pixels in the image are loaded.
Image temp = new ImageIcon(resizedImage).getImage();
// Create the buffered image.
BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
// Copy image to buffered image.
Graphics g = bufferedImage.createGraphics();
// Clear background and paint the image.
g.setColor(Color.white);
g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
g.drawImage(temp, 0, 0, null);
g.dispose();
// Soften.
float softenFactor = 0.05f;
float[] softenArray = { 0, softenFactor, 0, softenFactor,
1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };
Kernel kernel = new Kernel(3, 3, softenArray);
ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
bufferedImage = cOp.filter(bufferedImage, null);
// Write the jpeg to a file.
FileOutputStream out = new FileOutputStream(resizedFile);
// Encodes image as a JPEG data stream
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder
.getDefaultJPEGEncodeParam(bufferedImage);
param.setQuality(quality, true);
encoder.setJPEGEncodeParam(param);
encoder.encode(bufferedImage);
} // Example usage
public static void main(String[] args) throws IOException {
// File originalImage = new File("C:\\11.jpg");
// resize(originalImage, new File("c:\\11-0.jpg"),150, 0.7f);
// resize(originalImage, new File("c:\\11-1.jpg"),150, 1f);
File originalImage = new File("E:\\desktop\\新建文件夹\\banner.jpg");
resize(originalImage,587, 0.3f);
// resize(originalImage,150, 1f);
}
}

复制代码

种马先生 · 种马先生

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【阳哥专栏】Java图片缩放

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