java处理图片

㈠ 怎么用java实现抠图功能

package com.thinkgem.jeesite.moles.file.utils;

import com.drew.imaging.ImageMetadataReader;
import com.drew.imaging.ImageProcessingException;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;

public class ImageUtils {

/**
* 图片去白色的背景，并裁切
*
* @param image 图片
* @param range 范围 1-255 越大 容错越高 去掉的背景越多
* @return 图片
* @throws Exception 异常
*/
public static byte[] transferAlpha(Image image, InputStream in, int range) throws Exception {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
try {
ImageIcon imageIcon = new ImageIcon(image);
BufferedImage bufferedImage = new BufferedImage(imageIcon
.getIconWidth(), imageIcon.getIconHeight(),
BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon
.getImageObserver());
int alpha = 0;
int minX = bufferedImage.getWidth();
int minY = bufferedImage.getHeight();
int maxX = 0;
int maxY = 0;

for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage
.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage
.getWidth(); j2++) {
int rgb = bufferedImage.getRGB(j2, j1);

int R = (rgb & 0xff0000) >> 16;
int G = (rgb & 0xff00) >> 8;
int B = (rgb & 0xff);
if (((255 - R) < range) && ((255 - G) < range) && ((255 - B) < range)) { //去除白色背景；
rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
} else {
minX = minX <= j2 ? minX : j2;
minY = minY <= j1 ? minY : j1;
maxX = maxX >= j2 ? maxX : j2;
maxY = maxY >= j1 ? maxY : j1;
}
bufferedImage.setRGB(j2, j1, rgb);
}
}
int width = maxX - minX;
int height = maxY - minY;
BufferedImage sub = bufferedImage.getSubimage(minX, minY, width, height);
int degree = getDegree(in);
sub = rotateImage(sub,degree);
ImageIO.write(sub, "png", byteArrayOutputStream);

} catch (Exception e) {
e.printStackTrace();
throw e;
}

return byteArrayOutputStream.toByteArray();
}

/**
* 图片旋转
* @param bufferedimage bufferedimage
* @param degree 旋转的角度
* @return BufferedImage
*/
public static BufferedImage rotateImage(final BufferedImage bufferedimage,
final int degree) {
int w = bufferedimage.getWidth();
int h = bufferedimage.getHeight();
Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
w, h)), degree);
int type = bufferedimage.getColorModel().getTransparency();
BufferedImage img;
Graphics2D graphics2d;
(graphics2d = (img = new BufferedImage(rect_des.width, rect_des.height, type))
.createGraphics()).setRenderingHint(
RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2d.translate((rect_des.width - w) / 2,
(rect_des.height - h) / 2);
graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
graphics2d.drawImage(bufferedimage, 0, 0, null);
graphics2d.dispose();
return img;
}

/**
* 计算旋转后图像的大小
* @param src Rectangle
* @param degree 旋转的角度
* @return Rectangle
*/
public static Rectangle CalcRotatedSize(Rectangle src, int degree) {
if (degree >= 90) {
if(degree / 90 % 2 == 1){
int temp = src.height;
src.height = src.width;
src.width = temp;
}
degree = degree % 90;
}

double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
double len = 2 * Math.sin(Math.toRadians(degree) / 2) * r;
double angel_alpha = (Math.PI - Math.toRadians(degree)) / 2;
double angel_dalta_width = Math.atan((double) src.height / src.width);
double angel_dalta_height = Math.atan((double) src.width / src.height);

int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
- angel_dalta_width));
int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
- angel_dalta_height));
int des_width = src.width + len_dalta_width * 2;
int des_height = src.height + len_dalta_height * 2;
return new java.awt.Rectangle(new Dimension(des_width, des_height));
}

/**
* byte[] ------>BufferedImage
*
* @param byteImage byteImage
* @return return
* @throws IOException IOException
*/
public static BufferedImage ByteToBufferedImage(byte[] byteImage) throws IOException {
ByteArrayInputStream in = new ByteArrayInputStream(byteImage);
return ImageIO.read(in);
}

/**
* 获取照片信息的旋转角度
* @param inputStream 照片的路径
* @return 角度
*/
public static int getDegree(InputStream inputStream) {
try {
Metadata metadata = ImageMetadataReader.readMetadata(new BufferedInputStream(inputStream),true);
for (Directory directory : metadata.getDirectories()) {
for (Tag tag : directory.getTags()) {
if ("Orientation".equals(tag.getTagName())) {
return turn(getOrientation(tag.getDescription()));
}
}
}
} catch (ImageProcessingException e) {
e.printStackTrace();
return 0;
} catch (IOException e) {
e.printStackTrace();
return 0;
}
return 0;
}

/**
* 获取旋转的角度
* @param orientation orientation
* @return 旋转的角度
*/
public static int turn(int orientation) {
Integer turn = 360;
if (orientation == 0 || orientation == 1) {
turn = 360;
} else if (orientation == 3) {
turn = 180;
} else if (orientation == 6) {
turn = 90;
} else if (orientation == 8) {
turn = 270;
}
return turn;
}

/**
* 根据图片自带的旋转的信息 获取 orientation
* @param orientation orientation
* @return orientation
*/
public static int getOrientation(String orientation) {
int tag = 0;
if ("Top, left side (Horizontal / normal)".equalsIgnoreCase(orientation)) {
tag = 1;
} else if ("Top, right side (Mirror horizontal)".equalsIgnoreCase(orientation)) {
tag = 2;
} else if ("Bottom, right side (Rotate 180)".equalsIgnoreCase(orientation)) {
tag = 3;
} else if ("Bottom, left side (Mirror vertical)".equalsIgnoreCase(orientation)) {
tag = 4;
} else if ("Left side, top (Mirror horizontal and rotate 270 CW)".equalsIgnoreCase(orientation)) {
tag = 5;
} else if ("Right side, top (Rotate 90 CW)".equalsIgnoreCase(orientation)) {
tag = 6;
} else if ("Right side, bottom (Mirror horizontal and rotate 90 CW)".equalsIgnoreCase(orientation)) {
tag = 7;
} else if ("Left side, bottom (Rotate 270 CW)".equalsIgnoreCase(orientation)) {
tag = 8;
}
return tag;
}
}

㈡ Java程序中图片的使用方法

使用图像根据需要，可以有多种方法。
如果是放在组件中，如JButton、JLabel中，这些组件需要的是Icon接口的图像，那么使用ImageIcon类来加载图像比较好，new
ImageIcon(String
filename)或new
ImageIcon(URL
location)都可以直接加载图像文件。
甚至你还可以先用IO读出byte流，也能用byte[]创建ImageIcon。还可以由已有的Image来创建。
更为高级的用法是，你还可以先创建个空的ImageIcon，然后重写paintIcon(Component,Graphics,int,int)方法实现手工绘制！
如果你是要完成图像绘制，那么使用Image或BufferedImage比较好。
Toolkit.getDefaultToolkit().getImage(String或URL)就能加载图像。
这种方法需要一个图像观察者来监视图像是否加载完成，因为图像加载是异步的。通常，你用一个swing组件就可以充当这个角色。不过少用JLabel，因为我有一个程序用JLabel做观察者CPU占用率经常90%多，有时不出界面。用JPanel或JFrame都没出过这个问题。从API文档看，应该是所有的swing可视组件都实现了观察者接口。
选了观察者后，不用刻意观察加载情况，很简单的一个方法：swing组件的while(!prepareImage(Image));就可以了。
Image接口是Graphics类绘图drawImage要用的，所以绘制时应该选这个。
BufferedImage是实现了Image接口的图像，可以直接操作像索数据！所以利用算法生成图像再绘制，或图像处理可以使用这种方法。如浮雕、反色等。
加载方法是ImageIO类的read方法。

㈢ java程序将彩色png图片转为黑白的

帮你搜了一段网上流行的代码：

灰度变换
下面的程序使用三种方法对一个彩色图像进行灰度变换，变换的效果都不一样。一般而言，灰度变换的算法是将象素的三个颜色分量使用R*0.3+G*0.59＋B*0.11得到灰度值，然后将之赋值给红绿蓝，这样颜色取得的效果就是灰度的。另一种就是取红绿蓝三色中的最大值作为灰度值。java核心包也有一种算法，但是没有看源代码，不知道具体算法是什么样的，效果和上述不同。

/* GrayFilter.java*/
/*@author:cherami */
/*email:[email protected]*/
import java.awt.image.*;
public class GrayFilter extends RGBImageFilter {
int modelStyle;
public GrayFilter() {
modelStyle=GrayModel.CS_MAX;
canFilterIndexColorModel=true;
}
public GrayFilter(int style) {
modelStyle=style;
canFilterIndexColorModel=true;
}
public void setColorModel(ColorModel cm) {
if (modelStyle==GrayModel
else if (modelStyle==GrayModel
}
public int filterRGB(int x,int y,int pixel) {
return pixel;
}
}

/* GrayModel.java*/
/*@author:cherami */
/*email:[email protected]*/
import java.awt.image.*;
public class GrayModel extends ColorModel {
public static final int CS_MAX=0;
public static final int CS_FLOAT=1;
ColorModel sourceModel;
int modelStyle;

public GrayModel(ColorModel sourceModel) {
super(sourceModel.getPixelSize());
this.sourceModel=sourceModel;
modelStyle=0;
}

public GrayModel(ColorModel sourceModel,int style) {
super(sourceModel.getPixelSize());
this.sourceModel=sourceModel;
modelStyle=style;
}

public void setGrayStyle(int style) {
modelStyle=style;
}

protected int getGrayLevel(int pixel) {
if (modelStyle==CS_MAX) {
return Math.max(sourceModel.getRed(pixel),Math.max(sourceModel.getGreen(pixel),sourceModel.getBlue(pixel)));
}
else if (modelStyle==CS_FLOAT){
return (int)(sourceModel.getRed(pixel)*0.3+sourceModel.getGreen(pixel)*0.59+sourceModel.getBlue(pixel)*0.11);
}
else {
return 0;
}
}

public int getAlpha(int pixel) {
return sourceModel.getAlpha(pixel);
}

public int getRed(int pixel) {
return getGrayLevel(pixel);
}

public int getGreen(int pixel) {
return getGrayLevel(pixel);
}

public int getBlue(int pixel) {
return getGrayLevel(pixel);
}

public int getRGB(int pixel) {
int gray=getGrayLevel(pixel);
return (getAlpha(pixel)<<24)+(gray<<16)+(gray<<8)+gray;
}
}

㈣ 请问下java中导出图片怎么做

package com.xolt;
import java.io.FileOutputStream;
import java.io.File;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import java.awt.image.BufferedImage;
import javax.imageio.*;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;;

public class TestPOI {

public static void main(String[] args) {
FileOutputStream fileOut = null;
BufferedImage bufferImg =null;
BufferedImage bufferImg1 = null;
try{

//先把读进来的图片放到一个ByteArrayOutputStream中，以便产生ByteArray
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
ByteArrayOutputStream byteArrayOut1 = new ByteArrayOutputStream();
bufferImg = ImageIO.read(new File("C:/Documents and Settings/dingqi/Desktop/clip_image002.jpg"));
bufferImg1 = ImageIO.read(new File("C:/Documents and Settings/dingqi/Desktop/clip_image002.jpg"));
ImageIO.write(bufferImg,"jpg",byteArrayOut);
ImageIO.write(bufferImg1,"jpg",byteArrayOut1);

//创建一个工作薄
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("poi picT");
//HSSFRow row = sheet1.createRow(2);
HSSFPatriarch patriarch = sheet1.createDrawingPatriarch();
HSSFClientAnchor anchor = new HSSFClientAnchor(0,0,512,255,(short) 1,1,(short)10,20);
HSSFClientAnchor anchor1 = new HSSFClientAnchor(0,0,512,255,(short) 2,30,(short)10,60);
anchor1.setAnchorType(2);
//插入图片
patriarch.createPicture(anchor , wb.addPicture(byteArrayOut.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG));
patriarch.createPicture(anchor1 , wb.addPicture(byteArrayOut1.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG));

fileOut = new FileOutputStream("c:/workbook.xls");
//写入excel文件
wb.write(fileOut);
fileOut.close();

}catch(IOException io){
io.printStackTrace();
System.out.println("io erorr : "+ io.getMessage());
} finally
{
if (fileOut != null)
{

try {
fileOut.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}

poi中图片到到excel的方法 你需要准备poi包 试试看看